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 pages |
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Page 85
... moon will answer as well as the sun for this purpose , but the dark glass at the eye end of the telescope must then be removed . The instrument is pro- vided with two other dark glasses , which sink out of the way by raising two little ...
... moon will answer as well as the sun for this purpose , but the dark glass at the eye end of the telescope must then be removed . The instrument is pro- vided with two other dark glasses , which sink out of the way by raising two little ...
Page 267
... moon ; in taking the distance between which , the screw , M , should be moved more than above stated , until they are both nearly of the same brightness , as an observation can be made better when this is the case , than when otherwise ...
... moon ; in taking the distance between which , the screw , M , should be moved more than above stated , until they are both nearly of the same brightness , as an observation can be made better when this is the case , than when otherwise ...
Page 271
... moon , having a distance of 90 ° or more , are brought into contact just at the wire of the telescope which is nearest the plane of the sextant , fixing the index and altering the position of the instrument , to make the objects appear ...
... moon , having a distance of 90 ° or more , are brought into contact just at the wire of the telescope which is nearest the plane of the sextant , fixing the index and altering the position of the instrument , to make the objects appear ...
Page 273
... moon and a fixed star or planet , except that the instrument must be held in the plane of the two objects ; and it ... moon is always to be brought into contact with the sun or star , even though the moon's image is made to pass ...
... moon and a fixed star or planet , except that the instrument must be held in the plane of the two objects ; and it ... moon is always to be brought into contact with the sun or star , even though the moon's image is made to pass ...
Page 277
... moon , & c . , is the angle under which they appear to an observer situated on the earth ; the amount of which depends upon the real magnitude of the object , and its distance from the observer . The sun's semidiameter is set down in ...
... moon , & c . , is the angle under which they appear to an observer situated on the earth ; the amount of which depends upon the real magnitude of the object , and its distance from the observer . The sun's semidiameter is set down in ...
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Common terms and phrases
accuracy adjustment altitude artificial horizon ascertain barometer base bearing bisect centre chain Chauchina contour lines convenient correct cosine degrees depression direction distance divided divisions draw elevation equal error feet field-book fixed give given glass Greenwich ground height hills Hindustani language horizontal circle inches instrument intersection Lachar length limb longitude lunar distance Malaga mark means measured ment meridian meridian altitude method miles military sketching minutes moon mountain Nautical Almanac needle object obtained off-sets operations paper parallax parallel parallel ruler perpendicular picket plane plate position protractor purpose reading reconnoissance refraction rhombus right angles rivers road Royal Engineers ruler scale screw sextant side sine slopes spirit-level square staff station sun's suppose surface survey surveyor taken tangent telescope theodolite tion triangle trigono trigonometrical Trigonometrical Survey true tube vane vernier yards zero دو
Popular passages
Page 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.
Page 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...
Page 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.
Page 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. .
Page 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...
Page 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.
Page 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...
Page 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.
Page 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.