DECEMBER 25, 1886.] 403 . Access can be had from the upper floor to the upper If any air tends to accumulate in the The! vacuum, the bottom can be corked and the tube re- … MILLS’ GLYCERINE BAROMETER. protection. A cover was The readings have varied from 26 placed over the cistern, a | ft.3 in. upward. A range of 928 aaa i | i a in. corresponds to an inch of mer- avoid all trouble incident to the employment of joints, — im: a glass tube several feet more in length…
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