£380
A RARE CALCULATING CYLINDER BY McFARLANE, CIRCA 1835
printed arithmetic tables signed McFarlane's Calculating Cylinder pasted and varnished over 2in. three-section wooden former with axis and wooden end caps -- 6½in. (16.5cm.) high
The principal function of this highly portable instrument was to calculate the interest on English money and is one of the earliest examples of the format.
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