Details
A mechanical 'bi-functional' integrator
Constructed in brass with bevelled steel wheels and stamped H.L. Wirt and dated March 1925, all contained within a fitted box with typed calibration data in lid, the box -- 17¼ x 14¾ x 4in. (44 x37.5 x 10cm.) handle and securing hooks
See illustration
Constructed in brass with bevelled steel wheels and stamped H.L. Wirt and dated March 1925, all contained within a fitted box with typed calibration data in lid, the box -- 17¼ x 14¾ x 4in. (44 x37.5 x 10cm.) handle and securing hooks
See illustration