WHEN public interest in the curiosities of science was widespread, some fifty years ago, the possession of a microscope was a social necessity. The instrument to-day is no longer the popular plaything ...
Table of metric and English measures and table of natural sines on lining-papers. siris_sil_115192 ...
THE study of the properties and constitution of metals and alloys has made great progress during the last few years, and has reached a point when it can no longer be neglected by engineers. Steel ...
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