ClipArt ETC
"Sir David Gill devised a measuring machine which combines the rapidity of the glass—scale micrometer with the accuracy of the spider—line micrometer and simplifies the reductions of the observations at the same time." —Encyclopaedia Brittannica, 1910

Gill's Measuring Machine for Micrometer

"Sir David Gill devised a measuring machine which combines the rapidity of the glass—scale micrometer…

A Repsolds micrometer used by Cape Observatory. The large micrometer is used to accurately adjust the telescope by series of knobs and screws.

Repsolds Micrometer in Cape Observatory

A Repsolds micrometer used by Cape Observatory. The large micrometer is used to accurately adjust the…

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.

Repsolds Micrometer with Removed Box Cape Observatory

A micrometer with the box removed from Cape Observatory. The device rotates the telescope accurately…

"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

Repsolds Spider Line Micrometer for Quick Position Angle Motion

"Repsolds' more recent form of the spider—line micrometer (since 1893) for large telescope. Quick…

"The micrometer box, and of course with it the whole system of spider webs, is moved by the screw s, whilst the measuring web is independently moved by the screw S." —Encyclopaedia Brittannica, 1910

Repsolds Micrometer Box for Telescope Cape Observatory

"The micrometer box, and of course with it the whole system of spider webs, is moved by the screw s,…

A Repsolds micrometer box for Yerkes Telescope. The wheels on the sides adjusts the telescope sideways, up, and down accurately.

Repsolds Micrometer Box for Yerkes Telescope

A Repsolds micrometer box for Yerkes Telescope. The wheels on the sides adjusts the telescope sideways,…