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Title: aperture selector [Go to resource]
Description: Brass aperture selector and 2 brass rings. Aperture selector is basically a small cylinder with a circular disk, with 8 holes in it, offset on top. License: http://www.abdn.ac.uk/historic/Copyright_terms_conditions.shtml Publisher: ABDNP University of Aberdeen, Natural Philosophy Collection of Historical Scientific Instruments Rights holder: 47718 Temporal: 1800 Source: University of Aberdeen Identifier: http://calms.abdn.ac.uk/Geology/dserve.e... Go to resource More Like this...
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