Swift and Son Micrometer Adjustment Lever for Microscope

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“The long lever D is pressed to one side by the screw F, and is thus turned round the in E. On the tube very near to pin E is cylinder C, which by the action of the screw F is very slightly raised or lowered.” —Encyclopaedia Britannica, 1910


Encyclopaedia Britannica (11th ed., vol. 18) (New York, NY: The Encyclopaedia Britannica Company, 1910)


TIFF (full resolution)

662×2400, 267.7 KiB

Large GIF

282×1024, 43.6 KiB

Medium GIF

176×640, 22.1 KiB

Small GIF

88×320, 8.0 KiB