A Treatise on Military Surveying: Including Sketching in the Field, Plan-drawing, Levelling, Military Reconnoissance, Also a Particular Description of the Surveying Instruments Commonly Employed by Military Men, with Instructions for Using and Adjusting ThemW.H. Allen, 1847 - 344 Seiten |
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Seite 4
... Adjusting Them Basil Jackson. inch apart . * The purpose to be answered by ruling the lines at unequal distances , we shall presently see . The protractor is six inches long , and an inch and three- quarters wide , having across it a ...
... Adjusting Them Basil Jackson. inch apart . * The purpose to be answered by ruling the lines at unequal distances , we shall presently see . The protractor is six inches long , and an inch and three- quarters wide , having across it a ...
Seite 4
... Adjusting Them Basil Jackson. E W N S PROTRACTOR 50 60 70 80 90 100 110 120 130 140 PROTRACTOR N SECTION II . METHOD OF SKETCHING A ROAD BY MEANS. Fig : 2 IN .67 102 ° NW 59 ° NE D PLATE 2 . E S MN 951 240 BQ S Fig : 1 150 160 170 40 50 ...
... Adjusting Them Basil Jackson. E W N S PROTRACTOR 50 60 70 80 90 100 110 120 130 140 PROTRACTOR N SECTION II . METHOD OF SKETCHING A ROAD BY MEANS. Fig : 2 IN .67 102 ° NW 59 ° NE D PLATE 2 . E S MN 951 240 BQ S Fig : 1 150 160 170 40 50 ...
Seite 6
... Adjusting Them Basil Jackson. adjusted , that is , lengthwise it will lie north and south , while its ends will , of course , be east and west . Make a small mark on the paper at the 29th division or degree , when the protractor may be ...
... Adjusting Them Basil Jackson. adjusted , that is , lengthwise it will lie north and south , while its ends will , of course , be east and west . Make a small mark on the paper at the 29th division or degree , when the protractor may be ...
Seite 7
... Adjusting Them Basil Jackson. north - east , south - west , & c . , and term all bearings taken from the north pole of ... adjustment , by the east and west lines drawn on the paper , these may be considered as meridians ( north and south ) ...
... Adjusting Them Basil Jackson. north - east , south - west , & c . , and term all bearings taken from the north pole of ... adjustment , by the east and west lines drawn on the paper , these may be considered as meridians ( north and south ) ...
Seite 10
... Employed by Military Men, with Instructions for Using and Adjusting Them Basil Jackson. F 5+ E D 40 50 60 70 80 90 100 110 120 130 140 PROTRACTOR 1130 Paces QB 3 11 1200 FARM SECTION III . OF THE SIMPLEST METHOD OF SKETCHING A PLATE III .
... Employed by Military Men, with Instructions for Using and Adjusting Them Basil Jackson. F 5+ E D 40 50 60 70 80 90 100 110 120 130 140 PROTRACTOR 1130 Paces QB 3 11 1200 FARM SECTION III . OF THE SIMPLEST METHOD OF SKETCHING A PLATE III .
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Seite 195 - ... but it may be made in a variety of ways, so as to revolve on any light portable stand. The tube, when required for use, is filled with water (coloured with lake or indigo), till it nearly reaches to the necks of the bottles, which are then corked for the convenience of carriage. On setting the stand tolerably level by the eye, these corks are both withdrawn, which must be done carefully and FRENCH REFLECTINQ-LEVEL.
Seite 171 - THE first adjustment is that of the line of collimation; that is, to make the intersection of the cross wires coincide with the axis of the cylindrical rings on which the telescope turns : it is known to be correct, when...
Seite 228 - SO'OO inches as the average height of the barometer at the level of the sea (which is however too much), the altitude of the upper station is at once obtained by inspection of Table I, correcting for temperature of the stratum of air traversed by table II.
Seite 270 - ... reading off the arc; and half the difference of these numbers is the index error; additive when the reading on the arc of excess is greater than that on the limb, and subtractive when the contrary is the case. EXAMPLE. .
Seite 173 - ... error must be corrected by turning the screw, B, and the other half by the two parallel plate-screws over which the telescope is placed. Next turn the telescope a quarter round, that it may lie over the other two screws, and make it level by moving them, and the adjustment will be complete. Before making observations with this instrument, the adjustments should be carefully examined and rectified, after which the screw B should never be touched ; the parallel plate-screws alone must be used for...
Seite 145 - ... without any regard to thickness. This area, or the content of the plane figure, is estimated by the number of little squares that may be contained in it; the side of those little measuring squares being an inch, a foot, a yard, or any other fixed quantity.
Seite 299 - What is the error of the best tables now in use ? hours, or one minute of space in two minutes of time. Therefore, if we make an error of one minute in observing the distance, we make an error of two minutes in time, or 30 miles of longitude at the equator. A single observation with the best...
Seite 147 - ... in chains and decimals. Therefore, after the content is found, it will be in square links ; then cut off five of the figures on the right hand for decimals, and the rest will be acres. These decimals are then multiplied by 4 for roods, and the decimals of these again by 40 for perches.
Seite 104 - ... the number of links to be deducted from each chain's length, in measuring up or down an inclined plane, to reduce it to the horizontal measure.