 | John Butler Johnson - Surveying - 1880 - 744 pages
...movable arm MA, which carries a vernier reading on the graduated limb CD. There is another mirror, /, called the Horizon Glass, rigidly attached to the frame of the instrument, and a telescope pointing into this mirror, also rigidly attached. This mirror is silvered on its lower... | |
 | United States Army Service Schools. Ft. Leavenworth, Kansas - Military topography - 1895 - 318 pages
..."Copyright, 1887, by K™IM * Ksier. mirror I (Fig. 179) called the index glass, rigidly attached to a movable arm A called the index arm, and a mirror H...65° or 70° long graduated to degrees, half degrees, Ac., each half degree being numbered as a whole degree so the reading will be the angle subtended by... | |
 | Herbert Michael Wilson - Camping - 1900 - 964 pages
...called the index glass, which is rigidly attached to the movable arm a, called the index arm ; also 2. A mirror h, called the horizon glass, rigidly attached to the frame of the instrument; and 3. The arc on which the angles are read by means of the vernier at the end of the index arm. The... | |
 | Herbert Michael Wilson - Camping - 1900 - 986 pages
...glass, which is rigidly attached to the movable arm a, called the index arm ; also 2. A mirror //, called the horizon glass, rigidly attached to the frame of the instrument; and 3. The arc on which the angles are read by means of the vernier at the end of the index arm. The... | |
 | Herbert Michael Wilson - Camping - 1900 - 988 pages
...index glass, which is rigidly attached to the movable arm a, called the index arm ; also 2. A mirror k, called the horizon glass, rigidly attached to the frame of the instrument; and 3. The arc on which the angles are read by means of the vernier at the end of the index arm. The... | |
 | Herbert Michael Wilson - Camping - 1912 - 1014 pages
...glass, which is rigidly attached to the movable arm a, called the index arm ; also 2. A mirror //, called the horizon glass, rigidly attached to the frame of the instrument ; and 3. The arc on which the angles are read by means of the vernier at the end of the index arm.... | |
 | Howard Chapin Ives - Surveying - 1914 - 324 pages
...attached to the arm IL which carries a vernier, and which moves along the graduated limb BC; the other H, called the Horizon Glass, rigidly attached to the frame of the instrument. A telescope is also attached to the frame and points into the horizon SURVEYING MANUAL glass. The horizon... | |
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A mirror //, called the horizon glass, rigidly attached to the frame of the instrument; and 3. The arc on which the angles are read by means of the vernier at the end of the index arm. The planes of the two mirrors are so fixed as to be parallel, one... 