Catalogue of microscopes and accessories / maufactured and supplied by W. Watson & Sons.

  • W. Watson & Sons, Ltd.
Date:
1912-1913
Catalogue details

Licence: In copyright

Credit: Catalogue of microscopes and accessories / maufactured and supplied by W. Watson & Sons. Source: Wellcome Collection.

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    W. WATSON & SONS, LTD., 313 HIGH HOLRORN, W.C. 13 THE “GRIP” STAGE SPRING. This pattern has four distinct advantages :—(1) the free rotation of the Spring ; (2) a firmly fixed butt; (3) the easy removal of the spring and butt ; (4) objectives are not liable to catch against it when revolved on a nosepiece ; it is made of watch spring metal and lies quite flat, except at the tip. It will be seen from the above illustrations, that the fitting socket which goes into the stage is sprung, and that through the middle a conical-shaped pin passes, at the top of which a little head is attached by screwing. By screwing up this head an expansion of the fitting takes place consequent on the drawing upward of the coned pin. This causes the butt when in position to remain firmly fixed in the Stage. To release it, the head is unscrewed and the spring and butt are removed immediately. This is fitted to the stage of all our Students’ Microscopes. THE SUBSTAGE. All Watson microscopes have means for carrying the condenser, polariser, and other illuminating apparatus. In the cheaper instruments this consists of a plain tube, or underfitting (as shown in the Praxis microscope, page 271, sometimes with adjustment by a Spiral Screw movement (seepage 152), while in the case of the more expensive stands a compound substage, with rackwork and centring movements is fitted (see H.” Edinburgh Student’s microscope, page 43). In every case, these are of universal size, Royal Microscopical Society’s standard (f52/ in.) inside diameter. A still more elaborate pattern is fitted with a fine adjustment in addition to the rackwork focussing movement. This is shown in position on the Van Heurck and “ Royal ” microscopes, illustrated on pages 67 and 55 ; and is described on pages 59 and 52. HANDLES TO MICROSCOPE The shape of the Limb in all our Microscopes renders the usual handle un- necessary. Most so-called handles rarely accommodate more than two fingers and are quite unsuitable for carrying an instrument. Our Fine Adjustments cannot pinch the fingers, and the limb is so suitably shaped as to make it a natural and convenient part to lift by.