Aid to Survey Practice for Reference in Surveying, Levelling, and Setting OutC. Lockwood and Company, 1880 - 382 pages |
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Page 290
... Greenwich mean time . In route - surveys the necessary astronomical observa- tions , for the determination of latitude , longitude , and the direction of the meridian , are made at least once , or twice , a day ; the intervening ...
... Greenwich mean time . In route - surveys the necessary astronomical observa- tions , for the determination of latitude , longitude , and the direction of the meridian , are made at least once , or twice , a day ; the intervening ...
Page 302
... time , the latitude , the longitude , and the direction of the meridian . The Time . If the observer has a good chronometer giving nearly Greenwich mean time , and either gaining or losing steadily , he can calculate Greenwich mean time ...
... time , the latitude , the longitude , and the direction of the meridian . The Time . If the observer has a good chronometer giving nearly Greenwich mean time , and either gaining or losing steadily , he can calculate Greenwich mean time ...
Page 304
... mean local time ; the latter may then be compared with Greenwich mean time for the same moment , and the difference between them is the longi- tude of the place of observation expressed in time . Apparent local time might be obtained ...
... mean local time ; the latter may then be compared with Greenwich mean time for the same moment , and the difference between them is the longi- tude of the place of observation expressed in time . Apparent local time might be obtained ...
Page 305
... time corre- sponds to terrestrial longitudes , the former being reckoned from the first point of Aries , or the intersection of the ecliptic with the equator , the latter from the meridian of Greenwich ; the one being convertible into ...
... time corre- sponds to terrestrial longitudes , the former being reckoned from the first point of Aries , or the intersection of the ecliptic with the equator , the latter from the meridian of Greenwich ; the one being convertible into ...
Page 308
... mean noon , with differences for one hour ; the difference for any interval can then be applied to obtain the required reduced declination for any corresponding moment . The time used in the Nautical Almanac being Greenwich time , the local ...
... mean noon , with differences for one hour ; the difference for any interval can then be applied to obtain the required reduced declination for any corresponding moment . The time used in the Nautical Almanac being Greenwich time , the local ...
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Aid to Survey Practice for Reference in Surveying, Levelling, and Setting Out Lowis D'Aguilar Jackson No preview available - 2016 |
Common terms and phrases
Absc Abscissa accuracy adjustment adopted altitude amount angular measurement angular observation appliances astronomical observations axis azimuth base line bearings calculation centre chain surveys chord chronometer collimation compass convenient correct corresponding cosec cotg curvature curve determined difference direction distant point equal error feet figure fixed formulæ given graduated Greenwich mean ground Gunter's chains height hence horizontal angle inch instru instrument latitude length level-staff longitude lunar distance marked mean ment meridian method micrometer mile mode Nautical Almanac necessary object obtained operations Ordinate parallax pegs plane pole position principle purposes radii radius reading recorded reduced reflecting refraction right angles right ascensions route-surveys scale screws Section set-out setting-out sextant side sights sin² spherical spherical excess staff station staves subtended superelevation survey line surveyor tangent tangent point telemeter telescope theodolite tion transit traverse triangles Trigonometrical Trigonometrical Survey vertical wires
Popular passages
Page 21 - Those interested in the purchase and sale of estates, and in the adjustment of compensation cases, as well as in transactions in annuities, life insurances, &c., will find the present edition of eminent service.'* — Engineering.
Page 12 - A KEY AND COMPANION to the above Book, forming an extensive repository of Solved Examples and Problems in Illustration of the various Expedients necessary in Algebraical Operations.
Page 6 - Levelling. A TREATISE ON THE PRINCIPLES AND PRACTICE OF LEVELLING. Showing its Application to purposes of Railway and Civil Engineering, in the Construction of Roads; with Mr. TELFORD'S Rules for the same. By FREDERICK W. SIMMS, FGS, M. Inst. CE...
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Page 9 - AN OUTLINE OF THE METHOD OF CONDUCTING A TRIGONOMETRICAL SURVEY. For the Formation of Geographical and Topographical Maps and Plans, Military Reconnaissance, LEVELLING, &c., with Useful Problems, Formulae, and Tables.
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