45, CORNHILL, E.G., AND 122, REGENT STREET, W., LONDON. 



349 







P-, 



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KI 



EH 

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ARITHMOMETER. THOMAS DE COLMAR'S. 



Giving the product of 12 figures, Complete for use with Quotient 



be 



e 

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Ditto ditto, 16 figures 24 Ditto Ditto, 20 figures 



Instructions for use sent with the Instrument. 



17 17 



38 



