W. Watson & Sons Ltd

313 High Holborn, London, #17775, c. 1914

The "Royal" Model with the Fine Adjustment for the Substage

The following was taken from the 1925 Watson Catalog:

Carries larged-sized Eyepieces: has Mechanical and Sliding Draw-tubes: stage bolted to limb as in Van Heurck Microscope: new swinging-out Substage. For-high-class practical work, with absolute rigidity, in a convenient size, this Instrument is unexcelled, for it combines all those working qualities which have gained so high a reputation for thé Van Heurck Microscope, but in a more compact form and at a lower cost. The height, when placed vertical and racked down, is 11¾ inches. The tripod foot is shod with cork and has a spread of 7 inches.

The Mechanical Stage is our Standard pattern. It has a horizontal movement of 1½ inches, and is covered with ebonite attached by a vulcanizing process. It is fitted with a sliding bar.

The Mechanical Draw-tube with inner sliding draw-tube, as described page 75 is incorporated. It carries eyepieces 1.27 in. diameter, but, if so desired, can be supplied to carry eyepieces of the Students’ or Continental size.

The Union or Parts The method of uniting the stage and limb and bolting all together, as described with the Van Heurck Microscope, on page 76 is used here. Further, the limb is continued beneath the stage and carries the Compound substage. The latter is therefore quite independent of the stage itself. This will be more clearly understood by reference to the accompanying illustration. It will be observed that the Stage base is continued in a solid casting so as to embrace the Limb “A” to which it is screwed, the axis bolt passing through the hole at “B” The Limb “A” is continued downwards so as to support the stage base from beneath and carry the Substage on the part marked Al.

The Substage, which in the regular model has course adjustment and centering screws only, but may be provided with fine adjustment if desired at an extra cost, has, in addition, a new swing-out arrangement for turning the condenser and the centering fitting only, out of the optical axis, as shown in the illustration, “C” representing the axial position and “D" when turned aside. A spring catch secures all when the condenser is in use. E and F represent the milled heads of-the fine and coarse adjustments of the Substage respectively.

The Fine Adjustment is our standard lever pattern.

It will thus be seen that the many special features combined in this Microscope render it suitable for those who require an instrument of the highest class. It will be found to respond in the fullest manner to the exacting demands of the photo-micrographer and high-power worker. Its many conveniences enable the best results to be obtained rapidly with all types of objectives. It is invaluable in the laboratory, for which its strong construction and excellent mechanical stage are especially advantageous, while for the varied purposes of the Amateur it is unequalled.