Astronomical, Magnetic and Meteorological Observations Made at the United States Naval ObservatoryU.S. Government Printing Office, 1863 |
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Page xliii - Two follow-up urines should be obtained within one week after receipt of the original results, one at the beginning and the other at the end of the work week.
Page 681 - Results of Meteorological Observations made under the Direction of the United States Patent Office and the Smithsonian Institution, from the year 1854 to 1859 inclusive : being a Report of the Commissioner of Patents made at the First Session of the Thirty-Sixth Congress.
Page 565 - Astr. Nachr., 60, 1863, col. 123-126. 29. Ephemeris of Maia (66). Astr. Nachr., 60, 1863, col. 175-176. 30. Observations of asteroids . . . By James Ferguson and A. Hall. [Mr. Hall observed asteroids (48), (51), (64), (79).] Astr. Nachr., 61, 1863-64, col. 209-212. 278 31. Observations with the equatorial, 1862. Right ascensions and declinations of asteroids and comets, observed with the equatorial, 1862. [By James Ferguson and Asaph Hall. Commencing August 7, 1862, Mr.
Page 632 - The divisions of the scale are to 1°, and they are supposed to be correct. This barometer is fixed between two north windows of the northwest room on the first floor of the building, its cistern 103 feet above mean half- tide of the Potomac. It had been in use since the latter part of 1853, and the mercury in its tube and cistern being oxidized, advantage was taken of the presence of Mr.
Page xi - ... telescope has an aperture of 4.85 inches, with a focal length of 78 inches. It is attached to one extremity of an axis 42 inches long, the other extremity of which carries a counterpoise. The pivots of the axis are hollow cylinders of fine steel 3.5 inches in diameter. Their re-grinding by Mr.
Page xiii - ... matters, for which their experience and long service have shown them to be fully competent. THE MERIDIAN TRANSIT INSTRUMENT. This instrument was employed during 1862 as follows : With the exceptional cases when it was missed from inadvertence, the Moon's limb was observed whenever it was visible, and some or all of the Moon-culminating stars of the British Nautical Almanac were observed with it whenever it was possible to do so. During the equinoctial months, and the months preceding and following...
Page 681 - CONNECTICUT.— Perkins (Charles) Oration pronounced at the request of the Citizens of Norwich, Conn., on the Anniversary of American Independence. 8vo, half morocco.
Page xx - ... 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. Bond, were made by the machinist, Mr. Clark. The new pen is a small globe of thin glass drawn to a fine point on one side, and having a filling tube on the other. There is a delicate aperture in the point, through which chemical ink flows without accessory...
Page xxxv - Lyrse, whose times of transit were noted by eye and ear with the clock of the south wing. Reference has already been made to the re-grinding of the pivots of this instrument. Although the effect of inequality in them is eliminated by the method of observing, and the level error is not only always determined at the actual time of observation, but also for those points of the pivots upon which the instrument is then resting, it was deemed of interest to test the accuracy of Mr.
Page xxi - Column 4 contains the magnitude of the object as estimated by the observer at the time of the observation. Usually the estimate was made from the appearance of the star in the telescope, but with the brighter stars this result was occasionally combined with a naked-eye estimate made at the same transit. During the early part of the year, the ratings were only to half magnitudes, but the observers gradually made closer appreciations and endeavored to estimate to the nearest tenth. In this respect,...