Handbook for Government Surveyors |
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Results 1-5 of 23
Page 17
... subtracted from each angle , whether large or small , reduces them to the angles of a plane triangle , from which the calculation of the sides can be made with all needful accuracy . area Briefly , Excess in seconds = in which r2 X Sine ...
... subtracted from each angle , whether large or small , reduces them to the angles of a plane triangle , from which the calculation of the sides can be made with all needful accuracy . area Briefly , Excess in seconds = in which r2 X Sine ...
Page 19
... subtract this hour angle from its right ascension ; when west , add . The result , with sidereal time for mean noon of the day subtracted , gives a " sidereal interval , " which is the time of elongation very nearly . EAST . EXAMPLE ...
... subtract this hour angle from its right ascension ; when west , add . The result , with sidereal time for mean noon of the day subtracted , gives a " sidereal interval , " which is the time of elongation very nearly . EAST . EXAMPLE ...
Page 20
... subtract the hour angle , reduced to solar time ; and for western elongation , add the corrected hour angle . = Meridian passage in sid . time RA , less corrected sid . time of Greenwich mean noon . EXAMPLE . H. M. 8 . Sid . time ...
... subtract the hour angle , reduced to solar time ; and for western elongation , add the corrected hour angle . = Meridian passage in sid . time RA , less corrected sid . time of Greenwich mean noon . EXAMPLE . H. M. 8 . Sid . time ...
Page 24
... subtracted from 90 ° to obtain the zenith dis- tance ; then , when the zenith distance and the declination are both north or both south take their sum ; when one is north and the other south , take their difference , in which case the ...
... subtracted from 90 ° to obtain the zenith dis- tance ; then , when the zenith distance and the declination are both north or both south take their sum ; when one is north and the other south , take their difference , in which case the ...
Page 26
... subtract from its right ascension sidereal time for the day . To find mean time of meridian transit of a star , exactly , see page 36 or proceed as follows : -Convert the star's right ascension ( which is given in sidereal time ) to ...
... subtract from its right ascension sidereal time for the day . To find mean time of meridian transit of a star , exactly , see page 36 or proceed as follows : -Convert the star's right ascension ( which is given in sidereal time ) to ...
Common terms and phrases
ADELAIDE adjustment aneroid azimuth Barometer bubble calculated camp chain chainage clamp colat column Const corresponding cosec cosine cross hairs declination degrees diameter diff difference of longitude dist divided DUMPY LEVEL earth east elongation equal equator EXAMPLE formula gives GOVERNMENT PHOTOLITHOGRAPHER Height in Feet Hill horizontal angle hour angle hypsometer inches index error instrument intersection length logarithm Mean Refract merid meridian passage method miles and decimals mins minutes multiplied Nautical Almanac noted number of seconds observed altitude observed angles offset pegs plate point of Aries polar distance prime vertical radius of curvature readings right ascension sextant side sidereal sight sine spherical excess square root star star's stations Steel Tape subtract sun's centre survey surveyor taken tangential angles telescope Temp theodolite Thermometer triangle true bearing true meridian vernier zenith distance ΙΟ
Popular passages
Page 18 - The light reflected from the paper will show the cross hairs in the telescope of the theodolite. Then, let the vertical spider's line be brought exactly upon the polestar, and, if it is an eastern elongation that is to be observed, and the star has not yet reached the most easterly point, it will move from the line toward the east, and the reverse when the elongation is west. At the...
Page 134 - Sun from the meridian, at the instant when the true point of intersection of the ecliptic and equator (called the first point of Aries) is on the meridian of Greenwich ; and as the distance of the first point of Aries from the meridian, at the instant the mean Sun is on the meridian, is denominated Sidereal Time at Mean Noon, this may, by analogy, be termed the Mean Time at Sidereal Noon. It is the time...
Page 113 - Act contained shall take away or affect any right of action or other remedy which any person may have in respect of any loss or damage occasioned by any fire or for any trespass committed.
Page 134 - ... it may also be regarded as the arc of the equinoctial intercepted between those circles. It is measured toward the west as a positive direction through...
Page 62 - ... perfect the exhaustion. The actual movement at the centre of the elastic box, from whence the indications emanate, is very slight ; but this is increased 657 times at the point of the hand ; so that a movement to the extent of...
Page 122 - W ) v 2 (W) equal the sum of the weights for the mean of each night. The observations for longitude were submitted to Professors GP Bond and James Major for computation. Table "B...
Page 19 - ... line of sight not being at right angles to the axis of vertical motion 18.
Page 28 - Observed horizontal angle 77° 45' between Canopus and /3 Tri. Aus., at opposite elongations, pol. dis. 37° 22
Page 30 - ... will be the logarithm of the number of seconds and decimals in the arc — that is, no'oo.
Page 134 - Right ascension of the meridian is the hour angle of the first point of Aries.