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" The instrument should have a stable support, which may be a stone pier, a wooden post, or a good tripod. If a portable tripod is used its legs should be set firmly in the ground. The instrument should be protected from the direct rays of the sun by means... "
The Areas of the United States, the States, and the Territories - Page 49
by Henry Gannett - 1906 - 9 pages
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Report

William Bullock Clark, Edward Bennett Mathews - Geology - 1898
...observed in the measurement of all horizontal angles in the primary triangulation. EIGHT-INCH THEODOLITE. The instrument should have a stable support, which...a tent fly. It should also be shielded from winds which may jar or twist either it or its support. The foot screws of the instrument after it is leveled...
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Report

William Bullock Clark, Edward Bennett Mathews - Geology - 1898
...observed in the measurement of all horizontal angles in the primary triangulation. EIGHT-INCH THEODOLITE. The instrument should have a stable support, which...a tent fly. It should also be shielded from winds which may jar or twist either it or its support. The foot screws of the instrument after it is leveled...
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Report

William Bullock Clark, Edward Bennett Mathews - Geology - 1898
...INSTRUCTIONS FOR THE MEASUREMENT OF HORIZONTAL ANGLES. VOLUME II, PLATE XXXIX. EIGHT-INCH THEODOLITE. The instrument should have a stable support, which...a tent fly. It should also be shielded from winds which may jar or twist either it or its support. The foot screws of the instrument after it is leveled...
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Report, Volume 2

Maryland Geological Survey - 1898
...INSTRUCTIONS FOR THE MEASUREMENT OF HORIZONTAL ANGLES. MARYLAND GEOLOGICAL SURVEY. EIGHT-INCH THEODOLITE. The instrument should have a stable support, which...a tent fly. It should also be shielded from winds which may jar or twist either it or its support. The foot screws of the instrument after it is leveled...
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Maryland Geological Survey, Volume 2

Maryland Geological Survey - Geology - 1898
...THEODOLITE. The instrument should have a stable support, which may be a stone pier, a wooden post, or a pood tripod. If a portable tripod is used, its legs should...a tent fly. It should also be shielded from winds which may jar or twist either it or its support. The foot screws of the instrument after it is leveled...
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Bulletin, Issues 303-308

Geology - 1907
...of fine threads in the field of the microscope. "INSTRUCTIONS FOR MEASUREMENT OF HORIZONTAL ANGLES. The following general precautions should be observed...it is leveled for work, should be tightly clamped. Looseness of the foot screws and tripod is a common source of error, especially with small instruments....
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Bulletin - United States Geological Survey, Issue 307

Geological Survey (U.S.) - Geology - 1906
...of fine threads in the field of the microscope. INSTRUCTIONS FOR MEASUREMENT OF HORIZONTAL ANGLES. The following general precautions should be observed...it is leveled for work, should be tightly clamped. Looseness of the foot screws and tripod is a common source of error, especially with small instruments....
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Manual of topographic methods

Henry Gannett - Topographical surveying - 1906 - 88 pages
...of fine threads in the field of the microscope. INSTRUCTIONS FOR MEASUREMENT OF HORIZONTAL ANGLES. The following general precautions should be observed...it is leveled for work, should be tightly clamped. Looseness of the foot screws and tripod is a common source of error, especially with small instruments....
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Manual of Topographic Methods

Henry Gannett - Topographical surveying - 1906 - 88 pages
...of fine threads in the field of the microscope. INSTRUCTIONS FOR MEASUREMENT OF HORIZONTAL ANGLES. The following general precautions should be observed...means of an umbrella or a piece of canvas like a tent %. It should also be shielded from winds that might jar or twist either it or its support. The foot...
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Monographs of the United States Geological Survey, Volume 22

Geological Survey (U.S.) - Geology - 1893
...microscope. Flo. 7. Eight-inch Theodolite, detail. INSTRUCTIONS FOR THE MEASUREMENT OF HORIZONTAL ANGLES. The following general precautions should be observed...a tent fly. It should also be shielded from winds which may jar or twist either it or its support. The foot screws of the instrument after it is leveled...
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