ment of lenses design- the mines, and a boy (Hum- ed for other purposes. Refer- phrey Potter) was hired to ence is made to the hemisphe- rical condensing lenses used work these levers. Although this is not hard work, yet it by microscopists, and ordi- required his constant atten- nary meniscus… … ing marbles at the door. tem of lenses is prolonged up- CALCITE HEMITROPE. AIRY'S SPIRALS. QUARTZ POLARIZED CIRCULARLY. Looking at the engine he saw ward beyond the upper lens the ingenuity of the boy, to receive a Nicol prism, E, and also the advantage of his invention. The idea of quartz vary in…
Contained · Munn · Patented · Patents · Scientific American · Oil · Torpedo boat · Pig iron · American supplement · Cast Iron · Compressed air · Torpedo boats · Making ready · Address munn · Letters patent
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