A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
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Page 16
... parallel to the line of sights , and move- able on the centre of a graduated vertical circle , will serve to take angles of elevation or depression with great facility . " A small table of versed sines to a radius one , or unity ...
... parallel to the line of sights , and move- able on the centre of a graduated vertical circle , will serve to take angles of elevation or depression with great facility . " A small table of versed sines to a radius one , or unity ...
Page 18
... Surveying , Leveling , and Astronomy , " a work which every practical mathematician should pos- sess . The " Transit " may not be so generally known . It consists of two parallel plates attached to each other 18 A MANUAL FOR SURVEYORS .
... Surveying , Leveling , and Astronomy , " a work which every practical mathematician should pos- sess . The " Transit " may not be so generally known . It consists of two parallel plates attached to each other 18 A MANUAL FOR SURVEYORS .
Page 19
Containing Methods Indispensably Necessary for Actual Field Operations E. W. Beans. It consists of two parallel plates attached to each other in a manner somewhat similar to the circular plates of a theodolite . To the upper of these cir ...
Containing Methods Indispensably Necessary for Actual Field Operations E. W. Beans. It consists of two parallel plates attached to each other in a manner somewhat similar to the circular plates of a theodolite . To the upper of these cir ...
Page 27
... parallel to P t and each of them equal to it ; pro- duce s C to D as in the last case , so will D be a point in the line A B produced . NOTE . - A line run from a given point which does not terminate at the point designed , but falls ...
... parallel to P t and each of them equal to it ; pro- duce s C to D as in the last case , so will D be a point in the line A B produced . NOTE . - A line run from a given point which does not terminate at the point designed , but falls ...
Page 28
... parallel , there fore D E G C is a rhomboides , and E G is equal to CD . Consequently , A E is equal to the sum of the dis- tances A B , BG , G E , which are equal to A B , B C and CD added together . PROPOSITION 3 . To measure an angle ...
... parallel , there fore D E G C is a rhomboides , and E G is equal to CD . Consequently , A E is equal to the sum of the dis- tances A B , BG , G E , which are equal to A B , B C and CD added together . PROPOSITION 3 . To measure an angle ...
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Common terms and phrases
40 perches A E produced angles of deflection angular point back sight bearing of A B bring the sights bring the telescope centre pin circumferenter clamp the lower closing line correction course degrees difference of variation distance A C equal F B G feet Given A B internal angles kerfs last station let the needle line A B line C D line joining lines of survey lower plate magnetic magnetic bearings marked tree n¹ m¹ n³ m³ nier nonius compass nonius plate parallel perpendicular distance Place the instrument present bearing PROPOSITION quired random line right angles right line run a line run the line Set the instrument set the vernier sights to bear subtracted surveyor tance tang telescope to bear tion trapezoid traverse table tripod true bearing true line unclamp vernier to zero
Popular passages
Page 80 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Page 17 - ... more than half through its thickness, and intersecting each other at right angles at the centre of the block...
Page 58 - A line which is to be established from the course only, should be re-run at nearly the same season...
Page 58 - It must, therefore, be a matter of uncertainty 'whether we have the correct bearing of the line, even when the change for years has been ascertained with the utmost care.
Page 57 - The variation of the magnetic needle in declination, is subject to much irregularity, in some instances increasing, in other decreasing, and some years having scarcely a perceptible motion.