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DesBrisay Museum & Exhibition Centre

Rule, Slide


Accession number: 82.13X.19; 401A
Date: before 1982
Measurements: 65.8 cm L x 4.6 cm W x 0.6 cm Thick
Subject: PEOPLE, DUFF, WILLIAM
Description: TWO STRIPS. FASTENED AT ENDS SIDE BY SIDE WITH FOUR BRASS PLATES. BETWEEN STRIPS AND PLATES SLIDES ANOTHER STRIP POINTED AT ONE END WHICH IS GROOVED TO SLIDE OVER TONGUES OF OUTER STRIPS.
History of Use: UTILIZED TO PERFORM MANY FUNCTIONS OF THE MODERN DAY CALCULATOR - ADDITION, SUBTRACTION, MULTIPLICATION, DIVISION AND CALCULATION OF THE SINE TANGENT. (FILE CARD)