3 represent the anvil and the clamp which retains the vise. The handle, although of a single casting, has the appear- fastened to the axis of declination. The polar axis passes The anvil is recessed to receive the nut of the vise and the through a journal box, whose two extremities are held in the… … and from thence to the endless screw which actuates the polar axis. With this instrument the observer can sweep every point in the heavens without changing his position. The vise is of improved construction, which permits of the only change he makes in the latter being that of moving quickly…
Internet Archive · Public domain (published before 1931). Free to use for anything.
