Repsolds Spider Line Micrometer for Quick Position Angle Motion

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“Repsolds’ more recent form of the spider—line micrometer (since 1893) for large telescope. Quick motion in Position—angle for rough setting or for the measurement of close double stars is given by the large ring R.” —Encyclopaedia Britannica, 1910


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


TIFF (full resolution)

2400×2449, 1.7 MiB

Large GIF

1003×1024, 277.1 KiB

Medium GIF

627×640, 134.3 KiB

Small GIF

313×320, 42.0 KiB