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according accuracy adopted amount angle appears applied assumed Astronomical average bands brighter brightness catalogue circle column compared comparison comparison stars completed computed condition constant construction correction corresponding curve determined diameter direction distance effect employed entire equal equation errors estimate five four give given grades half Harvard College hundred important inch increase interval known latitude length less light limit logarithms magnitude mean measures meridian meter method micrometer microscope minutes motion nearly objects observations Observatory obtained orbit period photometer PICKERING placed plate portion position precision present probable Professor reduced reference Report residuals ruled satellite scale Science screw seems sets single space standard stars surface Survey systematic Table taken telescope tion unit variable variable stars variation various varying volume Weights zone
Halaman 273 - ... the reader is referred to the references at the end of this chapter for further information.
Halaman 274 - Yard 1760" are engraved, shall be, and the same is hereby declared to be, the original and genuine standard of that measure of length or lineal extension called a yard ; and that the same straight line or distance between the centres of the said two points in the said gold studs in the said brass rod, the brass being at the temperature of 62 ░ of Fahrenheit's thermometer, shall be and is hereby denominated the "Imperial Standard yard...
Halaman 310 - LENGTH-COMPARISONS of the STANDARDS of LENGTH of England, France, Belgium, Prussia, Russia, India, Australia, made at the Ordnance Survey Office, Southampton, by Captain AR CLARKE, RE, FRS, under the direction of Major-General Sir HENRY JAMES, RE, FRS, &c., Cor.
Halaman 311 - Sess. (1818-10), vol. vi., Doc. 109. Report on Weights and Measures, by JQ Adams, Sec. of State (Feb. 22, 1821). Executive Papers, 16th Cong., 2d Sess., Doc. 109. Report of Committee to whom was referred the Report of the Sec. of State. Reports of Committees, 17th Cong., 1st Sess. (1821-22), vol. ii., Doc. 65. Comparison of Weights and Measures of Length and Capacity, by FR Hassler.
Halaman 2 - Attach a microscope first to one end and then to the other end of the planer, and make the adjustment for level such that the surface of the mercury is sharply in focus under the microscope in the two positions. The bed-plate can then be blocked up at the intermediate points until every point is in focus. With regard to...
Halaman 5 - Bache telescope has been employed. The third research relates to a more careful study of the spectra of the brightest stars. For this work Mrs. Draper has lent the 11-inch photographic lens employed by her husband. .She has also furnished an admirable mounting for the instrument, and a small observatory to contain it. Two prisms have been constructed to place in front of the object-glass, the large one having a clear aperture of eleven inches square, and an angle of nearly 15░.
Halaman 308 - Narrative of the Origin and Formation of the International Association for obtaining a Uniform Decimal System of Measures, Weights, and Coins.