Because of the added advantages of the new penlight lamp with its new style solid glass bulb which renders a concentrated beam of light, I have found it useful to construct a magnifying lens attachment which would enlarge its scope beyond that for which it was intended.
For this I have devised a simple unit consisting of a collar through which the flashlight can be easily slipped, a connecting bracket and a lens mount which has incorporated in it a 6 × double aplanatic lens. This attachment fits firmly around the battery handle. The lens is so tilted that its focal point meets the beam of light. The entire unit is firm and light and, moreover, breakage of the flashlight, as so frequently happens, permits the attachment to be readily transferred to a new lamp with little additional cost. The bracket is firm and inflexible.
Krimsky E. FOCUSING MAGNIFIER ATTACHMENT. Arch Ophthalmol. 1939;22(1):110. doi:10.1001/archopht.1939.00860070126010
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