Surveying, as Practiced by Civil Engineers and Surveyors ...: Intended as a Handbook for Field and Office Use, Also as a Textbook for Students |
From inside the book
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Page viii
... Cross Hairs are truly Vertical and Horizontal - To Replace the Cross Hairs - To Replace a Spirit Level or Bubble Glass - Adjustment of the Sextant - Adjustment of the Box Sextant - Adjustment of the Compass - To make the Needle truly ...
... Cross Hairs are truly Vertical and Horizontal - To Replace the Cross Hairs - To Replace a Spirit Level or Bubble Glass - Adjustment of the Sextant - Adjustment of the Box Sextant - Adjustment of the Compass - To make the Needle truly ...
Page x
... Cross Hairs of Telescope - Ar- rangement for Sighting on Wires Suspended in Shaft - White Reflectors to Verniers - Alignment of the Mersey Tunnel - Align- ment of Dunmail Rise Tunnel on Thirlmere Aqueduct — Examples of Errors in ...
... Cross Hairs of Telescope - Ar- rangement for Sighting on Wires Suspended in Shaft - White Reflectors to Verniers - Alignment of the Mersey Tunnel - Align- ment of Dunmail Rise Tunnel on Thirlmere Aqueduct — Examples of Errors in ...
Page 60
... hairs or wires stretched across it , as shown in Fig . 54. Stadia hairs ( see Chapter VI . ) should be added as ... cross hairs of the diaphragm is obtained . By the addition of extra glasses an erect image in place of the usual inverted ...
... hairs or wires stretched across it , as shown in Fig . 54. Stadia hairs ( see Chapter VI . ) should be added as ... cross hairs of the diaphragm is obtained . By the addition of extra glasses an erect image in place of the usual inverted ...
Page 80
... hair brush . Very dirty glasses may be cleaned with alcohol . If dust lies on the cross hairs , it may be removed by taking off both eyepiece and object glass and blowing through . Unless the cross hairs are wire , this is apt to break ...
... hair brush . Very dirty glasses may be cleaned with alcohol . If dust lies on the cross hairs , it may be removed by taking off both eyepiece and object glass and blowing through . Unless the cross hairs are wire , this is apt to break ...
Page 82
... cross hairs exactly on B by the tangent screw d ' . Now unclamp a ' , and direct the telescope approximately on to the point c by hand . Clamp a ' again , and adjust the cross hairs exactly on c by the tangent screw b ' . The number of ...
... cross hairs exactly on B by the tangent screw d ' . Now unclamp a ' , and direct the telescope approximately on to the point c by hand . Clamp a ' again , and adjust the cross hairs exactly on c by the tangent screw b ' . The number of ...
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Surveying, As Practiced by Civil Engineers and Surveyors ...: Intended As a ... John Whitelaw, Jr. No preview available - 2015 |
Common terms and phrases
accuracy accurate adjustment altitude aneroid axis azimuth back sight barometer bench marks bubble tube calculated centre line chain line Chapter clinometer cloth collimation line compass contours correct cross hairs cross sections Crown 8vo curve D. K. CLARK deflection angle difference distance elevation Engineer equal Feet fence field book fixed fore sight formulæ given gradient graduated Greenwich mean ground Handbook height horizontal Illustrations instrument latitude length longitude magnetic bearings mean measured meridian method metres miles millimetres minutes Nautical Almanac object glass observed angle parallel perpendicular plane Plates plotted plumb line position Practical railway ranging rod right ascension scale screws sextant shown in Fig side slope spherical spirit level stadia hairs staff reading star station surface survey surveyor tacheometer Tacheometry taken tangent point tape telescope temperature theodolite traverse Treatise triangle Troughton & Simms tunnel vernier vertical angle wire
Popular passages
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