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 vi
... Vernier - Circumferentor or Surveying Compass - Whitelaw's Theo- dolite and Mining Dial - Sextant - Box Sextant - Use of Box Sextant - Theory of the Sextant - Measuring Angles with Box Sextant when Ground is not Level - Prismatic ...
... Vernier - Circumferentor or Surveying Compass - Whitelaw's Theo- dolite and Mining Dial - Sextant - Box Sextant - Use of Box Sextant - Theory of the Sextant - Measuring Angles with Box Sextant when Ground is not Level - Prismatic ...
Page 53
... vernier scale and also a revolution counter , at the junction of the two arms . At the end of one arm is a needle point with weight which is fixed into the paper . At the end of the other arm there is a tracing point . The instrument ...
... vernier scale and also a revolution counter , at the junction of the two arms . At the end of one arm is a needle point with weight which is fixed into the paper . At the end of the other arm there is a tracing point . The instrument ...
Page 63
... vernier plate t is a circular plate rotating on the vertical axis u , u , and perpendicular to it . It carries the supports ll , ll of the horizontal axis of the telescope . In the centre of the upper plate and between the supports ...
... vernier plate t is a circular plate rotating on the vertical axis u , u , and perpendicular to it . It carries the supports ll , ll of the horizontal axis of the telescope . In the centre of the upper plate and between the supports ...
Page 67
... vernier plate through 180 ° as read by the vernier , but these instruments are of course not nearly so useful as the ordinary transit theodolite . STANLEY LONDON Vernier . Before describing the measurement of angles with the theodolite ...
... vernier plate through 180 ° as read by the vernier , but these instruments are of course not nearly so useful as the ordinary transit theodolite . STANLEY LONDON Vernier . Before describing the measurement of angles with the theodolite ...
Page 68
... vernier is divided into 30 divisions , and each division is therefore equal to of a division on the graduated lower limb , ie . , of 30 ' 29 ' as before . If now the zero of the vernier be made to coincide with the zero of the graduated ...
... vernier is divided into 30 divisions , and each division is therefore equal to of a division on the graduated lower limb , ie . , of 30 ' 29 ' as before . If now the zero of the vernier be made to coincide with the zero of the graduated ...
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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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