 | 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
...circuit. 2d. The clock and signal records are by the same pen, the latter being distinguishable by their greater length. As originally constructed, the recording...the electro-magnet, the pen moves laterally about ^ of an inch, and thus the signals or records are in the form of wedges pointing laterally from the... | |
 | 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
...board. Nearly all the observations of the year were recorded by means of the cylinder-register. Its pen is a small globe of thin glass drawn to a fine point on one side and with a filling tube on the other. A minute aperture in the point permits the flow of chemical ink without... | |
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... the tube and acted upon by a spring. Whenever the point struck the paper on the cylinder, the plunger was forced in and ink escaped. But the action of this pen being unreliable at all times, arrangements for a new one, of the pattern devised by Mr.... 