A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 639
he theodoliteor stand of the instrument, the staff reading intercepted by the crosswires is proportional to the distance of the staff. The constantrequired in order to convert the intercept by the cross wires intothe distance of the staff may be determined by taking a reading ata known distance, or… … Use of erecting lenses in terrestrial telescope. most terrestrial telescopes are provided with a pair of lenses whose[unction is to invert the already inverted image produced by theobjective. In Fig. 569, ab is the real image produced by the objectivewhich is not shown. This falls at the focal…
Physics
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