A rare 19th Century lacquered brass mechanical intergrator, by Jakob Amsler, signed J. Amsler No. 101, and further engraved Elliott Bros London., the assembly comprising a main frame with two hardened steel bevelled-edge wheels with counter-poise, the whole pivoted on the shaped bridge raised on a steel pillar from the fretted bell-shaped sub-assembly, helical geared to subsidiary wheels with bone-ivory planimeter divided scales riding on hardened steel wheels and fitted with a hinged planimeter arm with similar pivoted gearing, with two anchor bars, original instruction for use leaflet (defective) and linen-backed drawing, in fitted walnut case -- 12¼in. (31.1cm.) wide

Details

A rare 19th Century lacquered brass mechanical intergrator, by Jakob Amsler, signed J. Amsler No. 101, and further engraved Elliott Bros London., the assembly comprising a main frame with two hardened steel bevelled-edge wheels with counter-poise, the whole pivoted on the shaped bridge raised on a steel pillar from the fretted bell-shaped sub-assembly, helical geared to subsidiary wheels with bone-ivory planimeter divided scales riding on hardened steel wheels and fitted with a hinged planimeter arm with similar pivoted gearing, with two anchor bars, original instruction for use leaflet (defective) and linen-backed drawing, in fitted walnut case -- 12¼in. (31.1cm.) wide
See illustration

Lot Essay

Jakob Amsler, Professor of Mathematics at the University of Schafhausen in Switzerland constructed his polar planimeter in about 1854. The intergrator, a further development of this instrument was specifically designed for use by naval architects for the measurement of metacentric heights etc.
c.f. Prof Gerard L'E. Turner Nineteenth Century Scientific Instruments, p.227-229
W.F. Stanley & Co Ltd Catalogue 1912 p.177

More from Maritime

View All