Baden-Powell's Unilens

The Unilens was a fixed focus single convex lens invented by Robert Baden-Powell. Functioning as a single element telescope it featured a 2.5 inch diameter lens mounted in a loop and achieved a maximum magnification of approximately four times (65mm x 4).[1] The makers did not claim it would work for everyone - due to variations in user's visual acuity but they did claim it would function for an estimated 75% of purchasers.[2] Consists of a lens 2.5 inches in diameter mounted in a metal rim it could be carried 'in a waistcoat pocket' and was supplied with a small clip and screw enabling the lens to be attached to a portable mount such as a walking-stick or umbrella.[3]

References

  1. ↑ A NOVEL FORM OF TELESCOPE - Whitesville NY News 1906
  2. ↑ Leathem, J. G. (2015-03-26). The Elementary Theory of the Symmetrical Optical Instrument. Cambridge University Press. ISBN 9781107493599.
  3. ↑ the elementary theory of the symmetrical optical instrument. CUP Archive. pp. 38–. GGKEY:DXCWGNP8PB1.
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