This is probably the most reliable optical device employed for copying. The principle of its construction will be understood in the diagram marked 2 in the engraving. The glass is simply a four-sided
camera lucida Splashing Paint
Old Engraved Illustration Of Camera Lucida Optical Instrument Popular Encyclopedia Published 1894 High-Res Stock Photo - Getty Images
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Camera Lucida. Camera Lucida. Camera Lucida.
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