A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams (1829)
Curtis, Thomas, fl. 1820 · London : Thomas Tegg · leaf 606
ust to shutout the light from passing between it and theupper edges of the slits in the brass cover. Thisis the mode of adjusting to zero; and it follows,that the upper edges of the slits must representthe beginning of the scale of inches. The frameis entirely made of brass tube, and above the… … jM.y-.. I im^ i|L
Encyclopedias and dictionaries · Aeronautics
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