W. Matthews Camden Rd., London
Case-mounted portable microscope c. 1858
While this microscope has a coarse adjustment by rack and pinion, it lacks a formal fine adjustment. To make up for the lack of a fine adjustment, a long brass rod is attached to the pinion of the main focusing adjustment thus, effectively, increasing the radius of the pinion allowing it to turn more slowly than it would if the knobs were used.
An identical example is located in the Science Museum, London; it is inventoried as follows:
CHEST MICROSCOPE BY MATTHEWS
Mathews 1855 advertisement
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