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Filar telescope micrometer made by Merz and Sons.

Astronomical instrument, filar telescope micrometer, brass / glass, used at Sydney Observatory, made by Merz and Sons, Germany, 1860-1878. A filar micrometer for use in conjunction with a telescope to make precise measurements. The filar micrometer is mounted on a graduated circle. A screw gauge at the top of the instrument turns a wheel with a graduated scale engraved into its surface. Below this is another screw gauge that moves a brass plate up and down. In the centre of the brass plate is the eyepiece for the micrometer. On the other side of the micrometer is a circular brass aperture that has been painted black. This can be removed to reveal a series of flat mirrors covering the conical shaped inside of the instrument. There is a hole with a screw fitting in the middle of the aperture.

View object on the British Library on Flickr Commons site (opens in new window).

(Accession num: H10006)

So far people have added content in 4 turns about this object.

Tags

dials, two, measurement, brass, Telescope, astronomy, brass, micrometer, Merz and Sons, Filar, measurement, instrument, glass, micrometer

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