The firm of "Carlsen Brothers" from Gentoft in Denmark built two interesting and innovative lines of mechanical calculators under the "Contex" brand name.Contex Adding machine, In grey/blue/cream plastic with 48 digits and 9 results window. Comes in brown embossed vinyl wooden case with hinges, and lined with red felt. Leatherette.CONTEX Serial no. 411017021adding machines, calculators

Used before the invention of electronic calculators, mechanical adding machines were most often used for long calculations. This calculator was used in the Ballarat School of Mines Physics Department. Addition and subtraction were perfomed by turning the larger side mounted crank forward or backward. the smaller crank lever zeros the two registers. Two buttons are provided to set the machine either to clear the number entry with each revolution of the crank or to repeat the entry. The largest button resets the keybord to all 0s.A calculator with shiftable carriage and digit separator rods between each row of keys.ballarat school of mines, calculator

The core memory of this calculator was a #D metal box. The pin must have been attached to a card reader or keyboard to enter the programme. According to Sharp’s serial numbering scheme, which encodes the month and year of manufacture of their electronic calculators at least through the mid-1970’s, this calculator was manufactured in September 1969. The technology used in the Memorizer 30/Memorizer 60 was very typical of that of the late 1960s, with small-scale integrated circuits containing a few gates or flip-flops, and a magnetic core memory array for storing the program steps that the user keyed in using the calculator attached to the device. (with thanks to Rick Bensene, Curator of the Old Calculator Museum, Beavercreek, Oregon, USA) ISharp Memorizer 60 (Model CSA-12). The Model CSA-12, called the "Memorizer 60", was an accessory that could be connected to a Sharp Compet 22 or Compet 32 electronic calculator to allow these machines to be "learn mode" programmed. Programs were "learned" from the keyboard of the calculator, and stored within a core memory array in the Memorizer 60. Programs of up to 60 steps could be stored. The Memorizer 60 could them "play back" the stored steps at high speed, to allow relatively complex math operations to be performed. (http://www.oldcalculatormuseum.com/m-sharpcsa12.html)Serial No. 910 106 09Bcalculator, memorizer 60, computers, programmable calculator, electronic calculators

Log Calculator - IRISH MKII was presented to MAJ. K HERDMAN by Intmed CSE 84/85 by way of a good humoured joke, Part of the KEVIN JOHN HERDMAN, 397661, collection. Rectangular plywood object with a variety of numbered circular holes. Printing on the front is in black.Printed on front in black: “LOG CALCULATOR, IRISH MKII. Presented to MAJ. K. Herdman by Intmed Cse 84/85 “."memorabilia, kevin john herdman

First programmable calculator used by Thompsons Castlemaine Ltd..1) Hewlett Packard programmable calculator model HP9100A. Cream coloured metal housing. Four segment keyboard with keys coloured grey, cream and fawn. .2) Selection of 10 diagnostic cards for above in a plastic case with a clear plastic hinged push back lid..1) Serial number on rear plate "816-00508". .2) Cards part number 5060-5919.engineering, programmable calculator

Slide rules were commonly used prior to the invention of the calculator. The Slide rule was used for performing multiplication, division and other scientific functions up through the 1960s and prior to the development of the electronic calculator. Used by Frank Smythe, engineer. Used up to the 1960's prior to the invention of the electronic calculator. Metal rule, hard cardboard case. The slide rule consists of two divided scales, one fixed and one movable, and a sliding window called a cursor. The Slide rule was used for performing multiplication, division and other scientific functions up through the 1960s and the development of the electronic calculator. System Darmstadt dmake, sun Hemm, Japan. "F. SMYTH" is annotated on the slide rule cover. slide rule, circa 1950 slide rule, trade measurements and calculations slide rule

The Slide Rule was made in 1940 and used by the Royal Australian Air Force during WW2.This is an original Slide Rule that was used by RAAF during WW2Wooden Slide Rule CalculatorRule, Slide M.G. Mk III. W.H.H. 1940slide rule ww2 raaf

Colour photograph of a battery operated calculator.calculator, mathematics

SHARP PC-1001 Electronic Calculator black plastic hooded calculator with black and white, blue and red buttons and ventilation slits at the back.PC-1001 SHARP

Used by donor's parentsMetal case containing Addition calculator with pointer attached to frameAddiator patents in all countriesinstruments, general

Used by RAF during WWIIMetal calculator with rotating metal dial and slide scalewith additional rotating ial on revrseCalculateur D'Estime A.A.F. Type 40navigation computer, aircraft computer, air force course computer,

Brown Oblong wooden box with rollers and knobs. - Stawell Butter Factory Commercial Calculatorstawell

Part of a collection of books, manuals, photographs, letters and clothing relating to the working life of Stuart Ascough. Stuart's career in the wool industry spanned over 43 years from 1960 to 2003 in various roles including Topmaking Plant Manager at Courtaulds Ltd. in Spennymore, U.K., Operations Manager at Port Phillip Mills in Williamstown Victoria, Marketing Executive, Early Stage Wool Processing at the International Wool Secretariat Melbourne, Australia and General Manager of Victoria Wool Processors Pty. Ltd. in Laverton North, Victoria. Throughout his career Stuart travelled extensively, and in the 1990s worked at many topmaking mills in China on quality improvement projects. He also provided technical advice and training at mills in India, Ukraine, Lithuania, Kyrgyzstan, Russia, Latvia, Byelorussia and other parts of Europe and Asia.8347.1 Blue, yellow, white and teal circular metal calculator with four independently movable discs and black numbered measurements. 8347.2 Green booklet containing working instructions for the Uster Calculator 8347.3 Laminated comparison chart of wool finenessstuart ascough, international wool secretariat, victoria wool processors, port phillip mills pty ltd, topmaking, career, wool industry, training, technical advice, mills

Small black platic calculator Canon ZX 2200 with sticker from The Australian Maritime College with manual.nautical instrument, navigation instrument, brian mcmahon, ship master

.1) Hinged lid wooden box with brass fittings and green felt covered rests inside. .2) "Fuller" type circular slide rule calculator Model No. 1. .3) Brass stand which slots into one end of box and holds calculator in position for ease of use. .4 ...7) Instruction booklets for operating the calculator. .8) Letter from importer re enquiry for circular slide rules to be used at Thompsons Engineering and Pipe Works.Imprinted on bakelite base of cylinder "Stanley / Trade Mark".trades, drafting, instruments, measuring

Metal slide rule type calculator, with scrolling graph. Has pencil/pen saddle and clip on left sideNavigational Computer Mk. IIIH Reg No. 68/250 Front. True Course, drift port Drift stbd Rear. I.C.A.N. Calibration, height correction, air speed correction