Aid to Survey Practice for Reference in Surveying, Levelling, and Setting OutC. Lockwood and Company, 1880 - 382 pages |
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Page 11
... axis of the instrument . The practical development of this principle was chiefly due to Porro , a Piedmontese military engineer . Tele- meters have been used in the United States Coast Survey , in a topographical survey in Schuykill ...
... axis of the instrument . The practical development of this principle was chiefly due to Porro , a Piedmontese military engineer . Tele- meters have been used in the United States Coast Survey , in a topographical survey in Schuykill ...
Page 12
... axis of the instrument in rear of the object lens . Then by proportion = , and by the general for- a a mula for the foci of lenses , 2 + 1 = 3 , hence a = ƒ { + f ; x and if A be the distance of the staff from the axis of the instrument ...
... axis of the instrument in rear of the object lens . Then by proportion = , and by the general for- a a mula for the foci of lenses , 2 + 1 = 3 , hence a = ƒ { + f ; x and if A be the distance of the staff from the axis of the instrument ...
Page 14
... axis of the instrument . In the first place , instead of using a single large object - lens , which would require a focal length of twelve times its diameter to eliminate excessive spherical aberration , he used a compound lens of two ...
... axis of the instrument . In the first place , instead of using a single large object - lens , which would require a focal length of twelve times its diameter to eliminate excessive spherical aberration , he used a compound lens of two ...
Page 15
... axis of the instrument , the required objects were attained , besides the additional advantage in observations having the line of sight in- clined to the horizon , that the requisite correction on this account is exactly effected simply ...
... axis of the instrument , the required objects were attained , besides the additional advantage in observations having the line of sight in- clined to the horizon , that the requisite correction on this account is exactly effected simply ...
Page 16
... axis , rarely exceed- ing one foot , is comparatively trifling . 2nd . That three horizontal hairs or wires are sufficient for all purposes , as the reading of the middle wire affords sufficient check on the other two ; that fixed are ...
... axis , rarely exceed- ing one foot , is comparatively trifling . 2nd . That three horizontal hairs or wires are sufficient for all purposes , as the reading of the middle wire affords sufficient check on the other two ; that fixed are ...
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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.
Page 16 - FRENCH. ~~ 24. French Grammar. With Complete and Concise Rules on the Genders of French Nouns. By GL STRAUSS, Ph.D. is 6d 25.
Page 16 - Spanish-English and English-Spanish Dictionary. Including a large number of Technical Terms used in Mining, Engineering, &c., with the proper Accents and the Gender of every Noun. By ALFRED ELWES.
Page 11 - Diagrams. i8mo, 2s. 6d. cloth. " As a really handy book for reference, we know of no work equal to it ; and the railway engineers and others employed in the measurement and calculation of earthwork will find a great amount of practical information very admirably arranged, and available for general or rough estimates, as well as for the more exact calculations required in the engineers
Page 7 - Professor Goodeve has given us a treatise on the steam engine, which will bear comparison with anything written by Huxley or Maxwell, and we can award it no higher praise.
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