The distance of the lucid points was the tangent of the magnified angles subtended by the stars to a radius of io ft.
Tangent sights were not much trusted at first.
With the exception of the addition of a pin-hole to the tangent sight and cross wires to the fore-sight, and of minor improvements, and Field of the introduction of French's crossbar sight and the artillery reciprocating sight, of which later, no great advance was sights.
4 the tangent sight has been raised from 0 to S, the line of.
The tangent sight was graduated in yards as well as degrees and had also a fuze scale.