Curta Type I Number 29249 

Addipresto 

Addipresto 

Solo 

Swift 

Countess 

Triumphator 

Muldivo Mentor 

Original Ohdner 

Nippon NCM HL21 

Facit 

Contex 

Burroughs, number A786493, produce by Burroughs Adding Machine Ltd., Nottingham, England, Parts Made in U.S.America. 

Sumlock Comptometer 

Sumlock Plus, Pounds, Shillings, Pence and Farthings Comptometer 

Sumlock Comptometer, works with Pounds, Shillings and Pence. To add in 11 pence in the rightmost column it would be neccessary to press the 9 and the 2 or the 8 and 3 etc, whichever one prefers. The rightmost digit counts up to 11 before carrying to the Shillings digit. 

Sumlock Comptometer, Shillings, Pence and Farthings as Decimals of a Pound 

Comptometer 993e, ElectroMechanical Calculator 

Olivetti 

AddoX, ElectroMechanical Calculator 

Gerber Scientific Instrument Company Variable Scale TP007100 

Gerber Scientific Instrument Company Graphanalogue GA 103 

Gunter Rule 12" 

Sector 

Napier's Bones Reproduction 

Napier's Berechenbar, a German version of Napier's Bones, it comes with only one set of Rods therefore whilst it works well as a demonstration piece you would need 5 or 6 for it to be useful for simple multiplication. 

Genaille Lucas Rods for Multiplication 

Genaille Lucas Rods for Multiplication. This is a nice reproduction set made in USA by Creative Crafthouse. 

Genaille Lucas Rods for Division 

Genaille Lucas Rods for Division. This is a nice reproduction set made in USA by Creative Crafthouse. 

Bergmann Unical Universal Calculator. This is a large set of multiplication tables. 

Spirule 

Young's Tidal Depth Estimator. Designed by Walter Young, M.Inst. P.I., Manufactured by Smiths (Calculators) Ltd, Beaminster. 

Fraction of an Inch Adding Machine 

Consul the Educated Monkey working replica 

Mr.Smart 

Recnomatic 

Qeeen Elizabeth II Coronation Pencil Case Calculator 

Positional Arithmatic using Lego. The Sum 10101010 x 1001 in Binary (170 x 9 in Decimal) is set up on the first board. The answer 10111111010 (1530) is shown on the second board. 

Cribbage Board a simple device for the addition and subtraction of points during card games 

Pencil Box with Multiplication Table 