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- Date:
- 1917
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- January 15, 2025
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- lens for opaque objects, supplemented by a special condensing lens, is substituted for the front lens
- Date:
- 1917
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- January 15, 2025
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- accommodated by the Universal. When changing from moving pictures to any other form of projection, the
- Date:
- 1917
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- January 15, 2025
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- the slide so that it may be easily lifted out by its margin. No. 4430 is regularly supplied with our
- Date:
- 1917
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- January 15, 2025
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- makes it possible to use the lantern under different wiring conditions by having a combination 5, 10 and
- Date:
- 1917
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- January 15, 2025
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- the lens aperture by the condensers. Other things being equal, the illumination depends on the
- Date:
- 1917
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- January 15, 2025
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- as a whole or to present a specimen quickly for comparison and discussion by members of the class
- Date:
- 1917
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- January 15, 2025
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- standards are made of heavy sheet metal by special forming tools. This method greatly reduces the weight of
- Date:
- 1917
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- January 15, 2025
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- electricity is not available. Its use has been rendered very convenient by the introduction of charged tanks
