Surveying, as Practiced by Civil Engineers and Surveyors ...: Intended as a Handbook for Field and Office Use, Also as a Textbook for Students |
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Page 60
... screws . When properly adjusted , the intersection of the hairs at the centre of the diaphragm is in the axis or ... screw at the side of the telescope near the eyepiece ( not shown in Fig . 52 ) . When properly focussed , the image of ...
... screws . When properly adjusted , the intersection of the hairs at the centre of the diaphragm is in the axis or ... screw at the side of the telescope near the eyepiece ( not shown in Fig . 52 ) . When properly focussed , the image of ...
Page 61
... screws ff , by means of which it is made parallel to the collimation Xx W STANLEY LONDON m ' line of the telescope , so that when the bubble is in the centre of its run the collimation line of the telescope is horizontal . which The ...
... screws ff , by means of which it is made parallel to the collimation Xx W STANLEY LONDON m ' line of the telescope , so that when the bubble is in the centre of its run the collimation line of the telescope is horizontal . which The ...
Page 63
... screws , n after the telescope is placed in its supports . The screw p clamps the verniers h , h to the vertical circle , and the tangent screw r is then used to adjust the vertical circle to any given angle , or to adjust the telescope ...
... screws , n after the telescope is placed in its supports . The screw p clamps the verniers h , h to the vertical circle , and the tangent screw r is then used to adjust the vertical circle to any given angle , or to adjust the telescope ...
Page 64
... screws g ' , g ' , g ' which rest on the lower parallel plate f ' . By means of these screws and the spirit levels on the upper plate t the instrument is " levelled up , ” making the vertical axis u truly vertical , and the upper and ...
... screws g ' , g ' , g ' which rest on the lower parallel plate f ' . By means of these screws and the spirit levels on the upper plate t the instrument is " levelled up , ” making the vertical axis u truly vertical , and the upper and ...
Page 65
... screws g ' , g , g ' provided for this pur- pose by which a nicer adjustment may be made . In Stanley's instrument ... screw c , which moves in the slot shown in B. The plates A and B thus clamped together may be moved again round the ...
... screws g ' , g , g ' provided for this pur- pose by which a nicer adjustment may be made . In Stanley's instrument ... screw c , which moves in the slot shown in B. The plates A and B thus clamped together may be moved again round the ...
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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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