 | JOHN R. EASTMAN, B. F. Sands, the hin.secretary of the navy, Coffin, Page, Steedman, Commander J.M. Gilliss, M.F. Maury, M.Narnall, James Major, T.J. Robinson, SIMON NEWCOMB, United States Naval Observatory, William Harkness, james major, u.s.n., lafayette maynard, u.s.n, william b. muse, u.s.n, john rodgers, u.s.n - 1872
...passage of dust between them. There are two apertures in the cover, each fitted with an ivory ferule cemented to the glass. The barometer tube passes freely,...the mercury in the cistern by a slow-motion screw passing through a flange from the rod and the lower arm which sustains it, and the latter may be read... | |
 | JOHN R. EASTMAN, B. F. Sands, the hin.secretary of the navy, Coffin, Page, Steedman, Commander J.M. Gilliss, M.F. Maury, M.Narnall, James Major, T.J. Robinson, SIMON NEWCOMB, United States Naval Observatory, William Harkness, james major, u.s.n., lafayette maynard, u.s.n, william b. muse, u.s.n, john rodgers, u.s.n - 1872
...dust between them. There are two apertures in the cover, each of which is fitted with an ivory ferule cemented to the glass. The barometer tube passes freely,...moved by a milled head without and a rack and pinion within the hollow cylinder. Attached to the vernier, and freely movable on the tube with it, there... | |
 | JOHN R. EASTMAN, B. F. Sands, the hin.secretary of the navy, Coffin, Page, Steedman, Commander J.M. Gilliss, M.F. Maury, M.Narnall, James Major, T.J. Robinson, SIMON NEWCOMB, United States Naval Observatory, William Harkness, james major, u.s.n., lafayette maynard, u.s.n, william b. muse, u.s.n, john rodgers, u.s.n - 1872
...apparatus is admitted through the smaller. The cistern is filled with mercury to within one- fourth of an inch of its rim. The external and internal diameters...moved by a milled head without and a rack and pinion within the hollow cylinder. Attached to the vernier, and freely movable on the tube with it, there... | |
 | Sir Richard Glazebrook - 1895 - 248 pages
...the cistern until the upper index is in contact with the mercury in the tube, the lower index is then brought into contact with the surface of the mercury in the cistern and the scale and vernier are read. The distance between the indices is thus found with accuracy and... | |
 | Richard Glazebrook, Sir Richard Tetley Glazebrook - 1895 - 682 pages
...the cistern until the upper index is in contact with the mercury in the tube, the lower index is then brought into contact with the surface of the mercury in the cistern and the scale and vernier are read. The distance between the indices is thus found with accuracy and... | |
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It is covered with a parallel plate of the same material, whose under surface and the rim of the bell have been ground smooth so as to prevent the passage of dust between them. There are two apertures in the cover, each of which is fitted with an ivory... 