The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 374
y in nine cases out often of each othersobservation, and would obstruct it by intercepting the view of the object. By the instrument of which the above is a sketch, both objects arebrought to the eye, as by a quadraut, at the same vertical line, and seen atthe same time, and the angla indicated by… … Briefly to illustrate its use, permit me to refer you to the sketch, sup.posing it requisite to take the angle formed by the two lines joining re-gpeclively A B, BC, the instrument is placed at the angle, and the limb xy z, which is flat, circular, and divided on the outer edge into 720 or…
Architecture · Civil engineering · Science
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