Baden-Powell's Unilens
Lua error in package.lua at line 80: module 'strict' not found. Lua error in package.lua at line 80: module 'strict' not found. 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
<templatestyles src="Reflist/styles.css" />
Cite error: Invalid <references> tag; parameter "group" is allowed only.
<references />, or <references group="..." />- ↑ A NOVEL FORM OF TELESCOPE - Whitesville NY News 1906
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
