Would have been used by a timer yard / merchant. Made by M. H. MEAR & Co Huddersfield the calculator is 200mm diameter in size.
Timber & board material calculator, it can find for running lengths of timber volume and price, metre run per cubic metre, price per metre run, for board materials will find area when length and width known, price of material per metre run, price when area known, find length of board when area known. The calculator can be used for other currencies by considering the price scale calibrations to be in dollars, rands etc.
Price is inclusive of postage to mainland UK