A wonderful and early 9 inch, 90 degree geared protractor by John Cail of Newcastle upon Tyne. Early knurling of the brass, precision, engine divided gradation of the arc and vernier as taught to him by Troughton (1820). Smooth action with locking tab to the geared arc section. One edge bevelled for drawing lines. No bruises. The arc in half degree increments and the vernier to 1/10 degree. Tight with no faults. c.1830. The early roping of the brass knobs and the flowing script signature would indicate this was one of his earlier products after moving from London to open his own shop.
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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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