In this instrument a considerable linear relative movement of the divided lens corresponds with a comparatively small separation of the double image, so that simple verniers reading to 6 1 0 in.
Measures 1 The circles by Reichenbach, then almost exclusively used in Germany, were read by verniers only.
The word is used also to designate the supporting frame or arms carrying the microscopes or verniers of a graduated circle.
Repsold introduced essential improvements in the meridian circles by substituting microscopes (on Jesse Ramsden's plan) for the verniers to read the circles, and by making the various parts perfectly symmetrical.
The two verniers on the azimuth circle having been read, the magnet is then inverted, i.e.