A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
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Page 23
... obstacles prevent the points A and B being seen from each other : 172 m B .. On the same side of A B , and perpendicular to it set off equal distances A C and B D ; place the instrument over one of these points C , and bring A MANUAL ...
... obstacles prevent the points A and B being seen from each other : 172 m B .. On the same side of A B , and perpendicular to it set off equal distances A C and B D ; place the instrument over one of these points C , and bring A MANUAL ...
Page 24
... obstacles prevent A and B be ing seen from an intermediate point , but C and D , ( case 2d , ) may be seen from the intermediate point F : Set the instrument at F , the intermediate point in a right line with C and D , and direct stakes ...
... obstacles prevent A and B be ing seen from an intermediate point , but C and D , ( case 2d , ) may be seen from the intermediate point F : Set the instrument at F , the intermediate point in a right line with C and D , and direct stakes ...
Page 26
... obstacles which pre- vent the line being run directly from A to D :仉 A B Run the line from A to B as before di- rected , where we will suppose an obstacle is met with , which prevents the line being continued . Set off at B ...
... obstacles which pre- vent the line being run directly from A to D :仉 A B Run the line from A to B as before di- rected , where we will suppose an obstacle is met with , which prevents the line being continued . Set off at B ...
Page 27
... obstacles , to lay off perpendiculars t P n B , & c . , from the line A D : Run P t any suitable course ; rallel to it , and make B n = P t . then run B n pa- Prolong t n to r and m as in the preceding case ; and run r s , m C parallel ...
... obstacles , to lay off perpendiculars t P n B , & c . , from the line A D : Run P t any suitable course ; rallel to it , and make B n = P t . then run B n pa- Prolong t n to r and m as in the preceding case ; and run r s , m C parallel ...
Page 31
... given points , when several intermediate stations have to be taken on account of intervening obstacles . Case 1. When the line can be run from the place of beginning : C A. num n T .5 n क n n A MANUAL FOR SURVEYORS . 31.
... given points , when several intermediate stations have to be taken on account of intervening obstacles . Case 1. When the line can be run from the place of beginning : C A. num n T .5 n क n n A MANUAL FOR SURVEYORS . 31.
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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.