Articles liés à The Practical Model Calculator, for the Engineer, Mechanic,...
The Practical Model Calculator, for the Engineer, Mechanic, Machinist, Manufacturer of Engine-Work, Naval Architect, Miner, and Millwright - Couverture souple
L'édition de cet ISBN n'est malheureusement plus disponible.
Synopsis
Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.
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Présentation de l'éditeur
Seconds make 1M inute marked M. or .60 Minutes 1H our Hr. 24 Hours 1D ay Day. 7D ays IW eek Wk. 4W eeks 1M onth Mo. 13M onthMD ay,6H ours, j1 jH yy or 365 Days, 6H ours. Sec. Min. 60 =1 Hr. 3600 =60 =1 Day. 86400 =1440 =24 =1 Wk. 604800 =10080 =168 =7=1 Mo. 2419200 =40320 =672 =28 =4 =1 31557600 =525960 =8766 =365J =1 Year. Wk.D a.H r. Mo. Da. Hr. Or 52 16 =13 16 =1 Julian Year. Da. Hr. M. Sec. But 365 548 48 =1 Solar Year. The time of rotation of the earth on its axis is called a sidereal day, for the following reason: If a permanent object be placed on the surface of the earth, always retaining the same position, it may be so located as to be posited in the same plane with the observer and some selected fixed star at the same instant of time; although this coincidence may be but momentary, still this coincidence continually recurs, and the interval elapsed between two consecutive coincidences has always throughout all ages appeared the same. It is this interval that is called a sidereal day. The sidereal day increased in a certain ratio, and called the mean solar day, has been adopted as the standard of time. Thus, 366-256365160 sidereal days =366-256365160 -1 or 365-256365160 mean solar days, whence sidereal day :mean solar day :: 365-256365160 :366-256365160 :: 0-997269672 :1 or as 1: 1-002737803, when 23 hours, 56 minutes 4-0996608 sec. of mean solar time =1 sidereal day; and 24 hours, 3minutes, 56-5461797 sec. of sidereal time =1 mean solar day. The true solar day is the interval between two successive coincidences of the sun with a fixed object on the earths surface, bringing the sun, the fixed object, and the observer in the same plane. This interval is variable, but is susceptible of a maximum and minimum, and oscillates about that mean period which is called a mean solar day. Apparent or true time is that which is denoted by the sun-dial, from the
(Typographical errors above are due to OCR software and don't occur in the book.)
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