Children's toys, and some elementary lessons in general knowledge which they teach (1877)
Erle, T. W. (Twynihoe William), 1828-1908 · London : C. Kegan Paul · leaf 248
erhaps the best form of speculum is that of a fabric of glass coated in front with a very thin layer of polished silver. Now glass, as everybody knows, will, under certain conditions, act as a mirror without being backed by amalgam, The ghost at the Polytechnic, for example, did not, like other… … was a main feature. Two reflectors of plain glass without any metal backing, one of them a flat disc, and the other a rectangular prism, form part of the ac- coutrements of every good microscope. In a pretty
Toys · Science
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
