Repsolds Micrometer with Removed Box Cape Observatory

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A micrometer with the box removed from Cape Observatory. The device rotates the telescope accurately by turning the wheels. This view of the micrometer is attached to the base.


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


TIFF (full resolution)

2400×2327, 1.8 MiB

Large GIF

1024×992, 275.8 KiB

Medium GIF

640×620, 133.7 KiB

Small GIF

320×310, 39.7 KiB