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610 Goldschid-form Pocket Barometer, Switzerland, late 19th century, lacquered brass instrument with inset thermometer, and engraved “Th. Usteri-Reinacher/Zurich/No. 1859” on the rotating silvered scale drum, with magnifier, housed in the original double-hinged leather-bound case. $300-400
613 Two 19th Century Quadrant Needles, Europe, unmarked, lacquered brass tri-foot instrument with squat central pillar, engraved scale divided 60-90-60 with iron needle, and a cast iron decorated base example with twin flat pillars, silvered scale marked 0–100, and needle, ht. 7 to 11 1/2 in. $200-300
611 Smeeth’s Transit Protractor and a Quadrant, protractor arm marked “Smeeth’s Transit Protractor/Mark I/Sole Makers/Negretti & Zambra/London,” with folding sights, trough level, scale, and mirror; the boxed Keuffel & Esser 4-in. quadrant with silvered scale and vernier. $150-250
614 Three 19th Century Demonstration Apparatuses, all lacquered brass instruments, one engraved “E. Ducrete a Paris,” with two shut-off valves and viewing window, ht. 9 to 10 in. $200-300
612 19th Century Sound Siren and Fire Piston Instruments, A.L. Robbins Co., Chicago, Illinois, mounted brass siren with engraved dual dials on the upper plate, and pierced sound rotating disc, with attached plaque reading as above, and a lacquered brass fire piston with chamber, and manual sliding piston, ht. 9 in. $100-150
615 Wheatstone’s Photometer by Secretan, Paris, 19th century, 1 3/4-in. dia. lacquered brass drum with geared reduction linkage, engraved on side in script “Secretan a Paris,” with hand-crank below, housed in the original velvet-lined fitted case. $200-300
616 Elliott Bros. Diminutive Demonstration Gyroscope, London, 19th century, oval baseplate engraved as above, central weighted gimbaled ring with engraved scale divided 0–40–0 with knife-edge at the upper portion for reading the scale on the stationary upright, ht. 4 in. $150-200
617 18th Century French Electrometer, brass-mounted colorless glass bottle with suspended straw indicators, etched scale on face of bottle, ht. 5 1/2 in. Literature: A similar example is found in Early Scientific Instruments Europe 1400-1800, by Anthony Turner, p. 274. $150-250 618 Two 19th Century Gauges, Netherlands and London, a 4 1/2-in. lacquered brass quadrant with engraved scale divided 0–40–0, blued needle, engraved “T. Van Pelt/Breda,” with two steel edges; the second engraved “Knight & Co./2 Forest Lane, London,” with silvered inset scale on main hinged arm and a vernier readout arm, lg. 6 in. $200-250 619 Schmalcalder Patent Dip Circle and an Unmarked Prismatic Compass, London, 19th century, lacquered brass instrument with 6-in. sight with fine adjustment knobs, and sunshades, bubble level, 3-in. circle or compass with fixed cross arms engraved “Schmalcalder/Patent/ 82 Strand/London” mounted at a right angle to central column, and weighted base, and an unmarked prismatic compass with folding sights, dia. 3 in. $200-300
Online bidding at www.skinnerinc.com
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