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Lot 18
A brass mounted hardwood apparatus cabinet possibly originally for a Foucault pendulum C.E.G. Simmons, dated 1923 The triangular section cabinet of substantial construction with bevel glazed front door enclosing a heavily engineered gimbal type bracket above large diameter brass collar inscribed Made and Presented by C.E.G. Simmons, Michaelmas 1923 and base applied with a small brass disc with central indent, the upper section with slot (presumably to provide access to impulse the apparatus) to frieze and three brass edged holes to the top panel, on adjustable feet, 66cm high, 33cm wide. Provenance: Private collection, Gloucestershire. This substantially constructed cabinet appears to have been designed to accommodate an apparatus which incorporated a mass supported from a gimbal type pivot. Included with the lot is a paper label inscribed Foucaults Pendulum -The pendulum is set off along the N-S line. The pendulum deviates from this line. Showing the rotation of the earth.
Lot 49
A Black japanned Fortin type mercury stick barometer Townson & Mercer, London, early 20th century With suspension loop above two-part silvered vernier scale calibrated on both inches (27 to 32) and centimetres (68.5 to 81.4), the upper margins engraved TOWNSON & MERCER, LONDON, No. 1241, THE STUDENTS STANDARD BAROMETER, Rd. No. 420297 and with vernier adjustment screw to bottom right corner, the slender cylindrical shaft above cistern incorporating glazed section over smaller diameter reservoir with level adjustment screw to underside, 97cm high; with original back panel applied with suspension brackets, opaque panels to assist with taking readings and with silvered Fahrenheit and Centigrade scale mercury thermometer, housed in an unusual pitch pine glazed corner cabinet, 122cm high overall. Provenance: Private collection, Gloucestershire. The current lot is made to the principles laid down by Nicholas Fortin (1750-1831) and incorporates a glazed cistern so that the level can be calibrated via the adjustment screw to the base against an inverted conical ivory cone in the cistern in order to obtain consistency in the readings. This particular type of barometer provides an accurate reading hence was generally adopted for laboratory use throughout the 19th and early 20th centuries.
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