Lord’s Prayer on a piece of glass of similar size? Stanhopes, peep-holes or peep-eye viewers, are just dating schrade pocket knives items. They contain all sorts of pictures, places and things and truly provide a view of the world in miniature. Though our discussion will include knives, it will not be limited to them.
Auto Ordnance Model 1911A1 D, the wooden stock has been sanded and is void of most finish. The original blue finish on dating schrade pocket knives metal is in excellent condition with just a small spot on the top of the barrel mid, 22 RF caliber tip up single shot boys rifle.
The lens itself is a polished glass rod approximately 7 mm in length and 3 mm in diameter. One end is convex, outwardly curved, to allow high magnifications for a short focal length. He was both inventor and politician. Not until 1860, however, with the invention of the miniature camera did the Stanhope lens enter the public eye. This involved the use of iodides and nitrates to produce light-sensitive glass and hence, the transparent black and white image seen in the Stanhope. Techniques such as these gave rise to modern microfilm know to us all.
As an interesting aside, discounting the obvious commercial application of Stanhopes in souvenir items, microphotography was put to practical use in 1870. Paris was under siege during the France-Prussian War. Having smuggled his equipment out of Paris, he photographed important dispatches as well as private mail on his tiny film. Firstly, many implements are found with the glass rod in place but no picture. Secondly, when viewing some pictures one sees many irregularities in the glass, particularly bubbles.