Two large refracting telescope accessories in bright brass with optics intact. The largest, unsigned with a minimum length of 26 cm. extending to 48 cm. with right angled prism intact (never touched-bright brass and anodized finish, no eyepiece lens). The other is an eyepiece extension by F. Davidson & Co. with address and patent number clearly displayed and all optics intact (16 cm. long). ID of the prism extension is 30 mm. with an OD of 32 mm. The Davidson has an OD of 39 mm. Probably belonging to a 4 inch refractor.
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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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