File:Micrometer Microscopes for Measuring the Altitude of the Airy Transit Circle (Side of Transit Circle, by Troughton & Simms, 1850).jpg

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Micrometer microscopes, Troughton & Simms, about 1850.

These microscopes are for viewing the degree scale engraved on the Airy Transit Circle. They allow the observer to read off the precise angle at which the telescope is pointing. Pointer-microscope P reads whole degrees, while the six hig-power microscopes A-F can make readings to an accuracy of 1/1000th of a minute. These six readings are then averaged for increased accuracy. There are additional mounting points for auxiliary, test microscopes.
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Micrometer Microscopes for Measuring the Altitude of the Airy Transit Circle (Side of Transit Circle, by Troughton & Simms, 1850)

Author Andres Rueda
Camera location51° 28′ 40.15″ N, 0° 00′ 05.47″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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This image, originally posted to Flickr, was reviewed on 11 March 2013 by the administrator or reviewer File Upload Bot (Magnus Manske), who confirmed that it was available on Flickr under the stated license on that date.

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current19:27, 11 March 2013Thumbnail for version as of 19:27, 11 March 2013924 × 953 (894 KB)File Upload Bot (Magnus Manske) (talk | contribs)Transferred from Flickr by User:Jacopo Werther

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