~RARE AND FINE SIMPLE THEODOLITE-W. & T. GILBERT-PATENT MODEL~

~RARE AND FINE SIMPLE THEODOLITE-W. & T. GILBERT-PATENT MODEL~

$600 US (500 GBP) + shipping

A rare and fine simple theodolite by W. & T. Gilbert, London. Patent model c.1825

Dimensions

5 1/2

Circa

1825

Country of manufacture

UK and Ireland

Categories: Surveying Instruments & Mining, Engineering antiques, Office Antiques, Patent & Salesmans Samples, Tools, Telescopes - Refracting

Description

Rare and fine patent model of a simple theodolite for plane table surveying by W. & T. Gilbert, London. c.1825. Signed on the green card 5″ compass, this instrument exhibits draw tube focusing of the telescope (3/4″ diameter), slide lock and push button stop for the compass and twin alidades. Wonderful condition noting one replacement screw. Clear optics with original crown (greenish) glass lenses, inverted image (10X) with cross hair. Housed in a raised, double bracket formation above the compass (divided into four 90 degree quadrants) with knurled, locking screw (presumably for rotation and/or removal). Alidades have open sighting with 1/4″ holes set at right angles to the telescope. The back of the instrument is blank (an indication of plane table use only-no mounting hole). Original lacquer (90+). William and Thomas Gilbert were a gifted team in London, from 1819-1831.

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CA ScientificaOpticae

Scientifica Opticae

Mark Hacking (Scientifica Opticae Inc.) has been an avid collector/dealer for over 30 years. A former Science teacher, he has an innate love for anything natural or mechanical. Specializing in optical (microscopes, telescopes), surveying, medical, weighing and drawing instruments, he is an active participant of the Scientific Instrument Fair in London. Living in Stratford, Ontario, Canada, with his wife and two children; Mark looks forward to meeting as many fellow collectors as possible, and has a worldwide following on eBay (Sciopti).

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