Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 668
he front of the lens a cap which he places there after adjust-ing the focus. The sliding screen is usually made with a narrow strip atth ^1. ver part, joined to the rest by a hinge, so that when it has been drawir.ough thv., |-,g retained in its position, and placed out of the way, by being:aucmg… … Iback, as shown at B, Fig. 308. The camera is usually made in two parts, as■shown in the figure, that at the back sliding within the other, so that a wi^-errange for adjustment is obtained, and the same camera may even be usedwith lenses of different focal _ lengths. Many improvementshave been made…
Inventions
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