The following was extracted from the 1911 Baker catalog:
The R.M.S. 127 Microscope.
This Stand, Fig. 4a, is capable of doing the highest Critical Work, and Photomicrography, and has coarse adjustment by the usual diagonal rack and pinion, with a range of 75 m.m. The fine adjustment by a lever, actuated by small milled heads placed on either side of the limb, giving a movement of 0125 m.m. for each revolution of the screw. The limb is fashioned to form a handle for lifting the instrument. Body 45 m.m. diameter, with double draw-tube
extending to 250 m.m. and closing to 120 m.m., both divided in millimetres, the lower tube is fitted with a stop, having universal screw to carry very low-power objectives, and also has a diagonal rack and pinion adjustment, to allow of a slow and regular alteration of the tube length. The Mechanical Stage, giving movements of 60 m.m. in the horizontal and 25 m.m. in the vertical direction, can be rotated through an angle of 270 degrees; the mechanism of the horizontal adjustment can be removed, leaving a large plain stage
into which spring clips are fitted. The substage of R.M.S. gauge, 3S.786 m.m.. is fitted with diagonal rack and pinion adjustment (and a fine adjustment as an extra, see below) and centring screws - - - £16 16 0