"Plano-" Quotes from Famous Books
 ... of good plate glass are employed, and the manufacturer's surface treated as flat (Fig. 56). In this way plano-convex lenses are easily and cheaply made. Finally the lenses have to be centred, an essential operation in this case. This is easily done by the reflection method—the edge being turned off by the ...
— On Laboratory Arts • Richard Threlfall |
