ID#

LOC

DESCRIPTION

Use. One turn of the crank automatically multiplies the accumulator by a single digit specified by a pointer in the upper left hand corner of the machine. The pointer is reset for each digit in the multiplier until the computation is complete.

CHM

Use. Multiplying 2432 by 598 may be performed as follows: Lift the hinged plate, turn and release the two milled knobs to bring all the figure wheels to show zero; lower the hinged plate in its position to the extreme left; set the number 2432 on the four slots on the fixed plate; set the lever on the left to "multiplication" and turn the handle eight times; lift the hinged plate, slide it one step to the right, and lower it into position; turn the handle nine times; step the plate one point to the right again and the turn the handle five times. The product 1,454,336 will then appear on the top row, and the multiplier 598 on the next row of figures.

CHM

Marked B4 and B50.79 (wr #).

CHM

Use. By means of movable cylinders any length of spiral line may be at once transferred to any other part of the scale, and multiplications and divisions containing a series of factors can be worked with facility. Logarithms of numbers are given by means of a scale on the longer index arm together with a circular scale on the first cylinder, so that powers and roots are obtainable. The surface of the middle cylinder bears printed tables of decimal equivalents, natural sines, etc.

Use. Operation is based on continuous integration. A curve is traced using the pointer, with the area read off on the dial after the complete perimeter has been traversed. As the pointer is moved the rollers that measure distance on the conical shaft calculate the product of the vertical distance times the horizontal distance. As a curve is traversed in a clockwise direction, the top area is integrated in a positive direction. On the return trip the integration is negative and the net value is provided.

Burroughs, 1 "Burroughs Model 5", Two Register, Keyed Wheel, Mechanical, USA, 5-146-1088, 28x25x12 cm, Black, Metal,, Buy, City Office Equipment, (76).

Burroughs, 1 "Burroughs" Single Register, Keyed Wheel, Mechanical, USA, A342273, 18x25x27 cm, , Buy, City Office Equipment, (76).

Through effective marketing and training of skilled operators versed in complement arithmetic at Comptometer Schools, these machines became the workhorse of the accounting profession in the first part of the century. They never successfully advanced into the electro-mechanical era, but remained purely mechanical, two-function adding and subtracting machines.

CHM

Monroe Calculating Machine Co., 1 "Monroe Electric Calculator No. 1", Three Register, Keyed Rotary, Electro-Mechanical, USA, 336948, 38x31x24 cm, Buy, City Office Equipment, (76).

Monroe Calculating Machine Co., 1 "Monroematic" Four Register, Automatic Keyed Rotary, Electro-Mechanical, USA, 506781, 18x23x34 cm, Gray, Metal, Buy, City Office Equipment, (76).

Friden, 1 "Friden Calculator Model D-8", Four Register, Automatic Keyed Rotary, Electro-Mechanical, USA, 202762, 38x26x20 cm, Buy, City Office equipment, (76).

Monroe, 1 "High Speed Adding Calculator", Three Register, Keyed Rotary, Electro-Mechanical, USA, 15x25x24 cm, Black, Buy, City Office Equipment, (76).

Burroughs, 1 "Burroughs Adding Machine Model A", Two Register, Keyed Wheel, Mechanical, USA, A605824, 22x15x12 cm, Black, Metal, 5 Digit, Buy, City Office Equipment, (76).

Underwood, 1 "Standard Typewriter No. 5" Typewriter, Mechanical, USA, 22x30x30 cm, Buy, City Office Equipment, (76).

IBM, 1 "IBM" Typewriter, Electro-Mechanical, USA, 112-42085, 26x44x40 cm, Gray, Justowriter Corp On Motor Housing, Buy, City Office Equipment, (76).

CHM

See B1.75

CHM

Cased English drawing instruments made in the second half of the l9th century. Brass and steel instruments, ruling pen with ivory handle; l3 separate items in lift-out tray. Small boxwood rule in space below. Rosewood veneered case and instruments in fine condition except that the large compass is missing its pivot locking nut and the brass has become a bit dull.

CHM

Cased presentation of an English rolling parallel rule. Pasted to the inside cover is the presentation certificate, "Bradford Technical College Prize Awarded to Fred Inman at the Annual Examination, 1893, by order of the Lords of the Committee of Her Majesty’s most honourable privy council on education."

Use. A pair of dividers is necessary to read the relationships on all sectors. This instrument is marked: "Chords, Sec, Lines, Tangents, tan, Ver Sine, Sines, & Num." The scale layout permits this sector to be used as a Gunter rule as well, although it is not laid out to follow any of the five editions of Gunter, but is close to the example in Stone (B18.78).

CHM

Burroughs Adding Machine Company, 1 "Burroughs" Single Register, Keyed Wheel, Mechanical, ca 1920, USA, A335701, 15x30x25 cm, Black, Metal, Complement Arithmetic Nine Digits, Buy, City Office Equipment, (78).

Friden, 1 "Friden Model 132" Four Register, Automatic Keyed Rotary, Transistor, USA, 3235, 26x45x54 cm.

1 Parallel Rule Parallel, Fixed, Rule, Craft, ca 1870, 45x6x1 cm, Rosewood and Brass, Buy, (78).

DG Marketing Ltd, 1 "International Metric Converter", Table, Manipulable, Craft, 1978, Hong Kong, 10x8x6 cm, Black, Plastic, Buy, (78).

CHM

1 Soroban, Single Register, Bead, Manual, 4x11x29 cm.

Use. Addition is accomplished by reading the appropriate bones along the diagonal. To obtain a product of 224 x 44, the rods 2, 2, and 4 are put alongside each other, and the result is read off by combining the numbers in the fourth row -- 0/8, 0/8, 1/6 -- for the correct answer 896. This is repeated and the two products added together to give 9856. The bones are sometimes associated with an abacus to provide a store in the multiplication process.

Use. On one side, the A line on the rule and the B and C lines on the slider are each numbered twice from 1-10, reading from left to right. The fourth line E is inverted, and is so arranged that 144 is opposite 1 and 10 on the A line. So that if length in feet on E be set opposite thickness in inches on C, the volume in cubic feet is read off on B opposite width in inches on A. The B line is subdivided into tenths, while the A, C, and E lines are subdivided into fourths. On the other side of the rule are A, B and C lines with the girt line (marked D) numbered from 4-40 and bearing various gauge points. The A and D lines are subdivided into fourths. The two edges of the rule bear scales of inches divided into quarter-inches.

CHM

A small replica of the Pascal-type adder made to illustrate the mechanism. For a description of the original Pascal machine, see B150.80.

CGB

Gordon’s slide rule used at MIT. Marked B32.79

CHM

Casio, 1 "Casio Mini Card Calculator" Five or More Registers, Computer-controlled, IC, Japan, 5x8 cm, Calculator and Case, Buy.

Use. Functions include logarithms, exponentials, trigonometric, decimals, scientific notation, and degrees and radians are used. Reverse Polish notation replaces conventional parenthesis.

Aluminum Housewares Co. Inc., 1 "Fairgrove Adder", Single Register, Pascal wheel, Mechanical, 1975, Hong Kong, 2x5x10 cm, Plastic, Buy, (79).

Use. Addition or subtraction is carried out by dialing the numbers starting with the least significant. A carry is performed by moving the final digit around the corner to the next linear register.

Foto-mem Inc., 1 Slide RuleLinear, 2-3 part, Slide Rule, Craft, Japan, 2x14x.5 cm.

CHM

NOTE: Has box in cabinet below display shelves.

CHM

Yanasa, Tokei, Keiki Co. Ltd., 1 "Geigy Pedometer", Single register, Escapement ratchet, Mechanical, Japan, 3d x1 cm.

CHM

Monroe Calculating Machine Co., 1 "Monroe" Calculator, Four Register, Automatic Keyed Rotary, Electro-mechanical, USA, J421231, 15x30x26 cm, Gray, 8 Digit, Buy, (79).

See B4.76.

CHM

Use. (See British Science Museum exhibit and description).

Bing, 1 "Bing No.2" Typewriter, Mechanical, ca 1930, Germany, 15x28x38 cm, 1926 patent pending, Case and Typewriter, Buy, (80).

Sharp Corporation, 1 "Elsi MATE El-8048" Electronic Calculator Soroban, Five or More Registers, Computer-controlled, IC, 1979, Japan, 921, 30x9x2 cm, Plastic, Buy.

Royal London Co Ltd, 1 "Executive Thought Organizer", Toy, Transistor, Japan, 11d x10 cm, Plastic.

CHM

J.S.M., 1 Navigator’s Gunter Rule, 2-3 Part Gunter Rule, Craft, ca 1800, England, 60x5x.5 cm, Buy, Historical Technology Inc., (79).

Stanley, 1 "Fuller’s Spiral Slide Rule" Spiral, 2-3 Part, Slide Rule, Craft, ca 1880, England, 33x10x10 cm, paper, wood, metal, cylindrical case and rule, Buy, Historical Technology Inc., (79).

See B5.76

Manlove, Alliott, Fryer & Co., 1 "Boucher’s calculating circle" Circular, 2-3 Part, Slide Rule, Craft, France, BUY, (79).

CHM

A version of the classical trigonometer signed and dated "THE LOWRY MFG. CO/BOSTON, U.S.A./PAT. 1887, ‘92, ‘96". It has two four and a half inch compass bearing dials, one fixed at the end of the twenty-six inch long graduate slotted base plate, the other sliding, and each with graduated pivoted arms of l8 3/8" radius. It was intended for the analog solution of the plane triangle knowing two angles and included side, two sides and the included angle, or three sides. Thus it was useful for problems both of navigation and gunnery.

See B4.76

The rule is specially arranged for the use of excise officers and maltsters in gauging computations. Slide rules for this purpose were first devised by Thomas Everard in 1683, and modified by Vero, Leadbetter and others. In this example, four scales appear on one side and the other side is blank.

CHM

See B29.77

CHM

See B9.76

Fowler & Co., 1 "Fowler’s Calculator" Circular, 2-3 Part, Slide Rule, Mechanical, 5660, 6d x1 cm, Buy, Ampersand, NY, (80).

CHM

J.R. Bunnell, 1 Telegraph Key And Receiver, Electro-mechanical, ca 1900, USA, 10x10x20 cm, Key and Receiver, Buy, Victor, Co., (80).

CHM

Marchant, 1 "Marchant" Four Register, Automatic Keyed Rotary, Electro-mechanical, ca 1950, USA, B-M-112311, 40x25x31 cm, Metal, Buy, (80).

CHM

Corona, 1 "Corona No. 3" Portable Typewriter, Mechanical, ca 1920, USA, 480206, 23x25x12 cm, Black, Metal, Carriage folds up over keyboard, Buy, (80).

See B42.80

Molle Typewriter Co., 1 "Molle No. 3" Typewriter, , Mechanical, USA, 6824, 25x28x33 cm, Black, Metal, Case and Typewriter, Buy, (80).

CHM

Swift & Anderson Inc., 1 Gunnery Level, 2-3 part, Sight and Level, Mechanical, ca 1910, Lead, Brass and Glass, Buy, Ron Hoffmann, NY, (80).

Adler, 1 "Favorit 2" Portable Typewriter, Mechanical, ca 1940, Germany, 2103, 36x28x11 cm, Black, German Keyboard, Case and Typewriter, Gift, Burt Still.

CHM

W & E Co., 1 Telegraph Receiver and Relay, Electro-mechanical, ca 1890, USA, 10x20x12 cm, Receiver and Relay, Buy, Victor, Co., (80).

CHM

Heath and Co. Ltd., 1 Sextant, 2-3 Part, Location-finder, Mechanical, ca 1920, England, W450, 35x25x17 cm, Certified at The National Physics Laboratory, Case and Sextant, Buy, Joe Stamps, NY, (80).

Digital Equipment Corp., 1 PDP-6 Signed Photo, Photo, Transistor, 1967, USA, Gift PDP-6 Engineers.

Digital Equipment Corp., 1 PDP-8 Flip-flop R201, Logic Module, Transistor, 1966, USA, 1x15x7 cm.

1 Vacuum Tube Logic Module M.D.Type 8, Logic Module, Electronic, 1950 USA, 108, 10x30x35 cm.

CHM

1 Field Microscope, Mechanical, France, 5x5x15 cm, Brass, Glass, Wood, Wooden Box and Microscope, Buy, Ron Hoffman, NY, (80).

Cohen, Harold, 4 "Amsterdam Suite", Artwork, 1977, 3 Line Drawings, 1 Colored, Framed Lithographs, Gift, Harold Cohen.

MARX, 1 "Dial Typewriter", Toy, Mechanical, ca 1950, USA, 15x15x30 cm, Buy, J Stamps, NY, (80).

See B36.79

Digital Equipment Corp., 1 PDP-11/20 Module Artwork, Artwork, Transistor, 1969, USA, 100x94 cm, Mylar in Plexi, Gift J O’Loughlin.

CHM

A.B. Dick, 1 "The Edison Mimeograph No. 1", Mechanical, ca 1900, USA, 13x33x43 cm, Wood Case and Frames, Complete Cased Set with Roller Etc Buy, (80).

CHM

JJ&EF Johnson Co., 1 Telegraph Key J-44, Electro-mechanical, USA, 12x8x4 cm, Gift, Clyde Still.

CHM

Use. Although the machine performs multiplication by repeated addition as in the Thomas type, the use of the Odhner wheel instead of the Leibniz toothed wheel led to a more compact design. The Odhner wheels fit very close together on the axle on the back. A setting lever, the end of which projects through a slot in the cylindrical portion of the cover plate, forms part of each wheel. If a lever is set against any figure (1 to 9) of its slot, a corresponding number of pins are made to project from its wheel. When the operating handle is turned, these pins gear with small toothed wheels of the product register, which in turn gear with the number wheels in front. The product register is mounted on a longitudinally movable carriage arranged in front of the machine, which carries a second counter for registering the multiplier or the quotient. The handle is turned in a clockwise direction for addition and multiplication, and counter-clockwise for subtraction and division.

CHM

An electrified modification of the Comptometer. See B9.76.

CHM

Use. See B3.76.

CHM

Metallograph Corp., 1 "Musketry Rule of 1918" Linear, 2-3 Part, Slide Rule, Craft, ca 1918, USA, 3x13 cm, Black, Metal, Neck String and Rule, Buy, Ron Hoffman, NY, (80).

A "Brunsviga" type machine made in Germany. See B80.80

See Bl50.80

Olivetti, 1 "Olivetti" Two Register, Keyed Wheel, Electro-mechanical, Argentina, Summa quanta 20, 15x15x30 cm, Plexi-glass, Metal, Paper Tape, Buy, City Office Equipment, (79).

The Curta is the ultimate example of the rotary mechanical calculator. Its small size requires better manufacturing technology than any other mechanical calculator. Model I had an 8-digit input setting, 6-digit counter, and 11-digit accumulator. Model II had an 11-digit setting, 8-digit counter, and 15-digit accumulator. Prior to the electronic calculator, the Curta was the only 4-digit portable calculator and as such was especially popular for use at car rallies.

CHM

A copy of the Burroughs printing-adding machine. See B42.

See B42.

CHM

Monroe Calculating Machine Co., 1 "Monroe No. 1" Three Register, Keyed Rotary, Electro-mechanical, USA, 20x25x30 cm, Metal, Buy, City Office Equipment, (76).

See Bl.75.

CHM

1 Drafting Set, Fixed, Parallel Rule, Scale, Compass, Craft, ca 1800, England, 15x17x30 cm, Brass, Wood, Marble, Cornelius Conklin (owner), Boxed with Box of Tools, Pens, Etc., Buy, (80).

Unlike earlier notations and devices using stones and marks, the abacus utilizes positional notation, including the representation of zeros, differences, with capabilities for multiplication and division. The Chinese abacus has beads in groups of 5 and 2, representing decimal digits. The Japanese first modified this to 5 and 1 and then 4 and 1.

CHM

1 Soroban, Single Register, Bead, Manual, 10x2x40 cm, Wood and Bamboo, 21 Digits, Buy, (80).

1 Abacus, Single Register, Bead, Manual, Taiwan, 2x4x6 cm, Green, Marble and Brass, 9 Digit, Abacus on Marble with Instruction Booklet, Buy, (80).

See Bl50.80.

CHM

KEUFFEL AND ESSER, 1 "E.A. Sperry’s Calculator Circular, 2-3 part, Slide Rule, Craft, USA, S650, 6d x2 cm, Pocket Watch Style, Buy, (80).

CHM

See B30.77

See B30.77

MARX, 1 "Junior Typewriter", Toy, Mechanical, USA, 28x13x18 cm, Gray and Blue, Tin, Bent & Rusty, Buy, (80).

CHM

See B21.78

Welch, 1 Teaching Slide RuleLinear, 2-3 Part, Slide Rule, Display, Craft, USA, 2x23x125 cm, Black, Masonite, With Hangers, Buy, (80).

CHM

T.S. & J.D. Negus, 1 Parallel Rule, Fixed, Rule, Craft, 8x45 cm, Brass, Inscribed with Degrees Buy, The Packet Boat, Boston, (80).

CHM

NOTE: Case in cabinet below display shelves.

CHM

1 Drawing Instruments, Fixed, Compass, Parallel Rule, Scale, Craft, ca 1850, England, 16x7x2.5 cm, Green, Shagreen Case, Brass, Steel, Ivory, Silver & Ebony, Fitted Case, 8 Instruments, Rule, Sector & Parallel Rule, Buy, Arthur Middleton, London, (80).

CHM

The D scale was used to read off translations of inches to centimeters, kilos to pounds, 480 and 500 sheet reams, and various weights of different standard paper cuts.

Dring and Fage, 1 "Leadbetter Slide Rule" Linear, 2-3 Part, Slide Rule, Craft, ca 1800, England, 31x3x2 cm, Brown, Boxwood, Four Sided Slide Rule with Slides on each Side, Buy, Peter Delahar.

A modified Coggeshal type slide rule with one brass and one wood slide. Navigational scales including meridian, chords, latitudes, and hours are inscribed. Freeth and Co. Brimingham is overstamped.

CHM

Use. "Palmer’s Computing Scale" was used to calculate square measures, cubic measures, timber measures, grain measures, liquid measures and interest rates from 3 percent to 10 percent on a daily and monthly basis. "Fuller’s Time Telegraph" (on the reverse) was used to calculate time lapse in days or weeks between any two given dates. In concert these two measures would be useful to dealers in grain, alcohol and other commodity trading.

CHM

Short scale type of "Fowler’s Textile Calculator" with two scales on one side. The other side holds a table equivalency for weft, looms, and reeds.

Use. To find the quantity of water discharged for any given nozzle and a known pressure, place press on scale "b" opposite nozzle on scale "a’, and read discharge through window in slide. To find height of jet for given pressure and nozzle diameter, proceed as above and read opposite arrow in center of slide, the height given on scale "d" for the appropriate nozzle.

1 "Circular Concise Slide Rule" Circular, 2-3 Part, Slide Rule, Craft, ca 1960, Japan, 8d cm, White, Plastic, No. 28; Reverse has Standard Equivalency Tables, Buy, Portobello Rd., (80).

1 Music Box, , Mechanical, 1980, Switzerland, 6.5dx5 cm, Plastic and Aluminum, Plays Jingle Bells, Buy, (80).

CHM

Use. Each key had three positions, upper and lower case and a figure that positioned three levels of the printing wheel.

CHM

1 Jacquard Loom Mechanism, Card-controlled, Loom, Model, Mechanical, ca 1805, France, 16x36x40 cm, Wood, Brass, and Steel, Paper Cards Added by Peter Delahar, Buy, Peter Delahar, (80).

L.M. Ericsson & Co., 1 Printing Telegraph Receiver, Electro-mechanical, ca 1890, Sweden, 7640, 36x42x17 cm, Brass, Wood, Beveled Glass, Key, Brass Spool, Paper Tape, and Receiver, Buy, Arthur Middleton, (80).

See B21.78

A protractor and architect’s proportions are inscribed on one side; engineer’s scale and vernier on the other.

CHM

Protractor and table with set scales at l/20,000, 100,000, and 250,000 inscribed on one side. The other side has scales of one half inch and one inch to the mile, a scale of 1/20,000 in meters and listing of metric equivalents.

1 Parallel Rule, Fixed, Rule, Craft, ca 1890, England, 3.5x15x.2 cm, Ebony and Brass, Buy, Maitland Antiques, (80).

CHM

R. Waddington, Coventry, 1 Lord’s Calculator Circular, 2-3 Part, Slide Rule, Craft, England, 7d x1.5 cm, Chrome and Glass, Buy, Maitland Antiques, (80).

CHM

Fowler’s (calculators) Ltd Sale, 1 "Fowler’s Calculator" Circular, 2-3 Part, Slide Rule, Craft, ca 1920, England, 6d x1 cm, Chrome, Glass and Paper, Long Scale Calculator, Buy, Maitland Antiques, (80).

Use. The rule indicated drill speeds for wrought iron, machinery steel and soft tool steel. One side shows revolutions per minute for diameters ranging from one-sixteenth to three inches for both high speed and carbon steel drills. The other side shows tap and drill sizes and the decimal equivalent for inch divisions.

Use. 1. Set at start. 2. Select wattage notch and dial clockwise to "stop"; 3. Repeat for distance of lamp from the subject; 4. Turn over and repeat for angel of light film speed and subject; 5. Read exposure against F/Ratio.

Thorens, 1 Musical Disk, Mechanical, 1980, Switzerland, 11d x.1 cm, Black and Yellow, Tin, Buy, (80).

CHM

Morris, 1 "Morris’s Measuring Instrument", 2-3 Part, Linear Measure, Mechanical, England, 5.5d x1 cm, Metal, Paper, Cloth, Glass, Case and Instrument, Buy, Maitland Antiques, (80).

CHM

Tacro Inc., 1 Map Measure and Compass, 2-3 Part, Linear Measure, Mechanical, Germany, 7x3.5x.5 cm, Chrome, Paper, Glass.

CHM

1 Drawing Instruments, Fixed, Drawing Instruments, Craft, ca 1900, England, 6x16x2.5 cm, Black Case, Brass, Steel, Wood, Cardboard, 7 Instruments and Case, Buy, Bermondsey Market, (80).

CHM

ADDI-COSMOS, 1 "B.U.G Calculator", Single Register, Pascal Strip, Mechanical, 5223, 4.5x20.5x4 cm, Brass, Steel, Wood, fabric, Instrument and Case, Buy, Portobello Rd, (80).

CHM

1 Drawing Instruments, Fixed, Drawing Instruments, Craft, England, 7x15x2 cm case, Wood, Fabric, Brass, Steel, 4 Instruments and Wood Case, Buy, (80).

CHM

1 Drawing Instruments, Fixed, Drawing Instruments, Craft, England, 10x19x4 cm box, Wood, Brass, Velvet, 10 Instruments and Case, Buy, (80).

CHM

1 Pantograph, Multiple part, Proportional Recorder, Mechanical, ca 1850, England, 85x15x8 cm Case, Brass and Wood, Engraved, J. Davis Cheltenham, Instrument and Case, Buy, Arthur Middleton, (80).

Odhner, 1 "Original Odhner" Odhner, Three Register, Rotary, Mechanical, ca 1920, England, 239-868452, Grey, Metal, Buy, Bermondsey Market, (80).

See B1.75

CHM

SEE B180.81 (Both marked the same)

CHM

1 Scale and Ruled Compass Drawing Instrument, Fixed, Scale and Compass, Craft, USA, 3x12 cm, Metal, "W.B.Pierce Co. Civil Engineers", Buy, (81).

CHM

Depose H.C., 1 Map Mileage Reader, 2-3 Part, Linear Measure, Mechanical, USA, 12x3.5dx.5 cm, Metal, Paper and Glass, Buy, (81).

CHM

1 Counting Beads, Single Register, Bead, Manual, USA, 27x19.5x1 cm, Red, Black, and Green Beads, Wood and Metal, Paint worn off beads, beads missing on top, Buy, (81).

Very compact with three positions for the keys and a wheel device. Small sized ribbon and removable carriage.

CHM

See B3.76.

EUGENE DIETZGEN CO., 1 "DIETZGEN MULTIPHASE STYLE-M IMPROVED DECIMAL TRIG TYPE LOG LOG RULE" Log-log, 2-3 Part, Slide Rule, Craft, 1954, USA, Cat. No. 1738, 5x32x.4 cm, Aluminum and Plexi, Buy, Lincoln City, Ore, (81).

Dietzgen, 1 Slide Rule, Linear, 2-3 Part, Slide Rule, Craft, USA, 26x3x1 cm, Wood and Paper, Buy, (81).

Stanley Rule and Level Co., New Britain, Conn, 1 Coggeshall Rule, 2-3 Part, Slide Rule, Craft, USA, 32x4x.4 cm, Wood and Brass, Buy, (81)

Richardson and Co., Middleton, Co., 1 Coggeshall Timber Slide Rule, 2-3 Part, Slide Rule, Craft, USA, 4x31.5x.3 cm, Boxwood, Brass, and Steel, Buy, NE Trade Fair, (81).

1 Spelling and Counting Board, Single Register, Bead, Toy, Craft, ca 1950, USA, 23d x 2 cm, red, Plastic and Wood, Buy, Lincoln City, Ore., (81).

1 "BABY CALCULATOR", Single Register, Pascal Strip, Mechanical, USA, 14.5x7.5x.7 cm, Black, Gold and Red, Metal, Buy, Lincoln City, Ore, (81).

CHM

Use. The dials show the French monetary unit, the livre, which was divided into 12 deniers, each subdivided into 20 sols. The essential part of the machine was its decimal carry; each toothed wheel moved forward one unit (one-tenth of a revolution on each wheel except those of deniers and sols) when the previous wheel had completed one revolution. Subtraction was based on complementary numbers that could be revealed by moving the strip at the top of the calculator.

Electric Specialty Mfg Co., Cedar Rapids, Ia., 1 Telegraph Key, Transduction, Electro-mechanical, ca 1900, USA, 7x8x18.5 cm, black, metal, Buy, (81).

CHM

SELSI, 1 Map mileage reader and compass, Analog Calcula, 2-3 part, Linear measure, Mechanical, ca 1930, Germany, 11x3.5x.5 cm, The handle also serves as a pencil. Buy, (81).

GKB

An usual all brass example of the rare form of pantograph devised and made by William and Andrew Smith and sold by William Harris c 1820. "A rare type of brass pantograph," P. Delahar.

Corona Typewriter Co., Inc. Groton, N.Y., 1 "CORONA FOUR" Typewriter, TRANSDUCTION, Typewriter, Mechanical, ca 1920, USA, H201124, 26x31x11 cm, Black, case and ribbons missing, Buy, Oregon, (81).

CHM

Burroughs, 1 "Burroughs Calculator" Adding machine, Digital Calcula, Single Register, Keyed Wheel, Mechanical, ca 1910, USA, 5-607901, 18x23x30 cm, Black and green, Metal, Stands on legs at a tilt for ease of operation. Buy, Rte 20 antique store in Wayland, (81).

CHM

Burroughs, 1 "The Burroughs Adding and Listing Machine" Adding Machine, Digital Calcula, Two Register, Key Punch, Mechanical, ca 1900, USA, Black, Metal with beveled glass sides, Buy, Victor, Co., (80).

Burroughs, 1 "The Burroughs Adding and Listing Machine" Adding Machine, Digital Calcula, Two Register, Keyed Wheel, Stand and motor, Mechanical, ca 1910, USA, Black, Metal with beveled glass, Adapted for motorized operation, Stand, motor, calculator, printer, Buy, Oregon, (81).

CHM

Cajori in his "history of the Logarithmic Slide Rule" (1909) lists this unique instrument as No. 211 and notes the manual.

CHM

See B1.75

CHM

Signal Electric Mfg. Co., 2 "Signal Telegraph Instrument" Telegraph Keys and Sounders, Telegraphy, Electro-mechanical, ca 1920, USA, 11x10x16 cm, Wooden base, brass, and other metals, Buy, Westford.

Use: From the Directions for Operating in the case: "First: Hold the machine with rack side toward you. Push carriage to the left to starting point. When doing this see that dog does not catch in rack. Insert paper between rollers from the front. Put finger on key of letter desired and swing it into notch in rim of typecase near the dog: Press downward to print. To make a space without printing, press down on any key near to but not in the notch. To ink apply only a drop of ink to each pad with the end of a matchstick or toothpick. Be careful not to bend the pads down so far as to prevent them from springing back into position. Use only Simplex Ink which will be supplied at 10 cents per tube, cheap ink destroys the face of the type. Do not oil. If keyplate sticks, take a rag moistened with vaseline and hold against underside of keys at the notch and twirl type plate around a few times. If the carriage does not move forward freely, apply a little vaseline to the carriageway where it rubs. Caution! Keep oil or vaseline away from rubber type and ink pads. Oil will swell and destroy the letters."

See B165.81.

Wolverine Supply and Manufacturing Co., 1 "Adding Machine", Digital Calcula, Single Register, Pascal Strip, Mechanical, ca 1950, USA, 10x15x23 cm, Red, blue, and cream, Tin, Buy, Knotty Pine Antique Market, (81).

1 Navigator’s Sector, Analog Calcula, 2-3 Part, Sector, Craft, ca 1880, USA, 3.5x16x.3 cm, wood, BUY, Knotty Pine Antique Market, W. Swanzey, (81).

CHM

1 Navigator’s Sector, Analog Calcula, 2-3 Part, Sector, Craft, ca 1880, USA, 3.5x16x.3 cm, Wood, Buy, Amherst Outdoor Antique Market, (81).

CHM

1 Coggeshall Slide Rule, Analog Calcula, 2-3 Part, Slide Rule, Craft, ca 1850, USA, 4x33x.5 cm, Wood and Brass, No makers name, wood cracked, shows signs of real wear, Buy, Knotty Pine Antique Market, West Swanzey, NH, (81).

CHM

Pickett & Eckel, Inc., 1 Slide Rule, Analog Calculator, 2-3 Part, Log-log, Craft, 1960, USA, 405171, 31x6x3 cm, Yellow, Aluminum and Plexi, Box, Case, instruction pamphlet, and guarantee, Buy, Westford flea market, (81).

CHM

1 Abacus, Digital Calculator, Single Register, Bead, Manual, 29x14x2.5 cm, Wood, 13 digit, Buy, Amherst outdoor antique market, (81).

Burroughs, 1 "Burroughs" Adding Machine, Digital Calculator, Two Register, Keyed Wheel, Mechanical, ca 1950, USA, 8A193393, 22x37x20 cm, Green and Black, Metal, 8 digits with paper tape printing, Buy, (81).

An early Comptometer with the springs showing on the upper keys. The keys are molded differently on alternative rows to give the operator a "feeling" of relative location. The walnut cabinetry and tooling was clearly a hand-made.

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Siemens Brothers & Co., London, 1 Printing Telegraph, Links and Switches, Electro-mechanical, ca 1900, England, 12145, Wood and brass, Does not work, Buy, Portobello Rd., London, (80).

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Nine inch brass sector as described by Edmund Gunter (1581-1626) in 1623. Unsigned by probably made by Elias Allen in 1623.

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1 Counting Beads, Digital Calculator, Single Register, Bead, Manual, 37x2x44 cm, red and black beads, wood and metal, 9 rows by 10 digits, Buy, Joe Stamps, NY, (81).

See B150.80

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See B137.81 (Both marked the same)

1 Abacus, Digital Calcula, Single Register, Bead, Manual, 29x14x2.5 cm, Wood, 13 digit, Buy, Amherst outdoor antique market, (81).

CHM

NOTE: Marked B179.81

SELSI, 1 Map mileage reader and compass, Analog Calcula, 2-3 part, Integrator, Mechanical, ca 1930, Germany, 110x35x5 mm, The handle also serves as a pencil. Buy, Reading flea market, (81).

Digital Equipment Corporation, 1 2 PM Flip Flop, Transistor, 1966, USA, R20YC.

Data Produ