MAKER: Sidle &. Co
MODEL: No. 2
c. 1881
SIGNED:J. W. Sidle & Co, Lancaster, PA, ACME
SERIAL NUMBER:350
AUTHOR: Barry Sobel, with the assistance of Brian Stevenson
Editor: Joseph Zeligs
The mechanical stage of the Acme No. 2 rotates on a ring calibrated in single degrees from 0 to 360, labeled every 10.

The ring can be centered by the three capstan screws (blue arrows). A clutch (red arrows)in the front of the ring controls the ease with which the stage can rotate and can be used to lock its rotation at any degree of rotation:

The stage has concentric controls oriented upwards. The stage has calibrations with verniers to indicate the precise location of a slide placed against the register. The register can be turned counterclockwise out of the way, and a hole in the knob contolling it can accept accessories such as a stage forceps.
