Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 19
ach end, and thus necessarilypreventing the slightest displacement. The observer next proceeds to read off the indications furnishedby the two scales of the instrument; he sets first down the numberson the left-hand scale R, which come opposite to the top fine ofthe fluid on the left-hand side, and… … Left altitude be . . Right altitude . . The sum divided . Would give for the desired altitude 46° 2047° 40 2)94° 47° The necessity for taking a mean of the two readings arises fromthe liability of the fluids to expansion, for were no change to takeplace in their thermometric condition after the…
Mechanical engineering
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