W. Watson & Sons Ltd.

313 High Holborn London #10844

The Van Heurck No.1 model microscope, c. 1910

W. Watson & Sons Ltd, 313 High Holborn London #10844. The Van Heurck No.1 model microscope, c. 1910

W. Watson & Sons Ltd, 313 High Holborn London #10844. The Van Heurck No.1 model microscope, c. 1910

 

"W. Watson & Sons Ltd, 313 High Holborn London #10844. The Van Heurck No.1 model microscope, c. 1910

 

Watson Van Heurch 10844 stage Watson Van Heurch 10844 stage

The Watson firm first manufactured this type of microscope in 1891 at the suggestion of the renowned Belgian microscopist Henri van Heurck (1838-1909). When first introduced, the microscope incorporated a continental (horseshoe) style base, but, as with the present example, stands with an English tripod base were also produced and became the standard form.The microscope is constructed in brass with bright lacquered and oxidized surface finishes and is about 16 inches tall when set up for use with the draw tubes partially extended as shown in some of the photos. The main focus is by rack and pinion and the fine focus is by calibrated micrometer screw (1 rev, 1/13 mm). There are two drawtubes with the main drawtube calibrated and having movement by rack and pinion. The substage is focused by rack and pinion, has a fine focus by micrometer screw located at the side of the stage, and has centering adjustments.

This microscope originally resided at The National Physical Laboratory (NPL) in Middlesex, UK. The NPL was founded in 1900. One of the mandates of the Laboratory from its beginning was to evaluate the leading optical instruments of the time. It is possible, given that this instrument has seen little if any use, that this Watson Van Heurck No.1 was among those instruments. Alternatively, it could have been one of the Laboratory's working instruments used for taking physical measurements. The instrument is equipped with an advanced centering stage where the movements are fully calibrated reading by verniers to 1/10th of a mm. The divisions of the circumference of the stage in degrees can be read to by a vernier to 5 minutes.The stage rotation is by pinion working on a circular rack.

 

 

microscope case

Van_Heurck-1923 microscope

Watson microscope fine adjustment

The fine adjustement mechanism

Elsewhere on this website is another example of the Watson Van Heurck No.1 with a less elaborate arrangement of the stage. This microscope is based on the design of the Belgian botanist Henri Van Heurck (Antwerp 1839-1909). The following was extracted from the 1923 Watson catalog:

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