A complete numbered set of bone sliders, probably for a small solar micrscope c.1800. Half opaque (most specimens missing-could be replaced with minerals, shells and insect parts) and the other half transparent with all specimens and rings/micas intact. Narrow format (84 x 11 mm.) with 6 cells in each. No chips or cracks. Great for display. Often missing or replaced.
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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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