The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 367
Fig. 90. … Fig. 91. which fasten It firmly over the centre of the instrument. Theattachment to the side, Fig. 92, is effected by means of a spindlefrom the attached telescope which fits into the hollow axis ofthe central telescope and is secured by means of a clip which MINING SURVEYING. 337
Surveying
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