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- Date:
- 1917
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- January 15, 2025
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- . Fire Shutter —Simple in construction; positive in operation; supplied with upper and lower film shields
- Date:
- 1917
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- January 15, 2025
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- Bausch & Lomb Optical Company Simplex Regular Equipment Mechanism —Enclosed, fire and dust-proof
- Date:
- 1917
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- January 15, 2025
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- requirements of fireboards and under- writers and they have been approved by the National Board of Fire
- Date:
- 1917
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- January 15, 2025
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- and provided with hardened steel bearings; driving gears protected by pressed-steel guard; three
- Date:
- 1917
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- January 15, 2025
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- subject, and a projection lens with reversing mirror carried above it on a vertical rod. Microscopical
- Date:
- 1917
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- January 15, 2025
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- illumination from this burner equals that from a four-jet burner and is entirely free from flare streaks or
- Date:
- 1917
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- January 15, 2025
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- Bausch & Lomb Optical Company Optical Projection Although unappreciated and undeveloped for
- Date:
- 1917
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- January 15, 2025
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- height of 7 in. from table by two cast iron supports of 11-in. spread with elevating screws front and
- Date:
- 1917
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- January 15, 2025
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- Balopticon CGT Mounted on Tripod. On account of its light weight and compactness and the ready interchange
- Date:
- 1917
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- Date Added:
- January 15, 2025
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- , such as pieces of apparatus, anatomical specimens and the like, will be placed on the object holder, a
