... 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|