Surveying and levelling instruments

Surveying and levelling instruments

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... and uses; with other apparatus and appliances used by civil engineers and surveyors in the field William Ford Robinson Stanley ... 8, a candle-flame at acb forms its focus at aaquot;a#39;caquot;a#39;baquot;a#39;, where all rays converge to form an image in the following manner : a€” Every point of the candle Fig. 8. a€” Diagram of the convergence of rays of light. throws its light upon every point of the surface of the lens, and, therefore, anbsp;...

Title:Surveying and levelling instruments
Author:William Ford Robinson Stanley
Publisher: - 1901


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