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Description: | Stanley maker's label on the inside of the box. MANU William Ford Stanley and Company April 26, 1927 Eltham, London, England. This is a a box for a Stanley theodolite and variation compass. A variation compass or declinometer was originally designed to determine the very small angles of magnetic variation caused by solar flares. The phenomenon of magnetic variation was reputedly first demonstrated to the king of Siam by Father Tachart in 1682. George Graham noticed small variations in declination in 1722 using his own design of sensitive compass. Anders Celsius (1701-1744) visited Graham in 1735 and obtained from him an instrument made by Jonathan Sisson. When he returned to Uppsala in 1737 he began hourly observations and published these in the 1740 Proc.Roy. Soc. Acad. Sci. After the death of Celsius his assistant, Olof Hiorter, continued the research. The connection between the aurora borealis and was made independently by Celsius and Hiorter in April 1741 during an episode of particularily violent solar activity.
However, this one was used to acurately align a theodolite in particular the Stanley theodolite GLAHM 129478/1 with a U shaped frame or as Astronomers know it an altitude azimuth (altazimuth or vertical and horizontal angles) transit.
The theodolite was used at the the University's observatories at Dowan Hill and the present site at the Garscube Industrial Estate at Maryhill. The instrument accurately measures angles. It was designed for use as a surveying instrument in a process whereby position is calculated by triangulation using trigonometry. | License: | http://www.hmag.gla.ac.uk/spirit/rights/ | Publisher: | Hunterian Museum and Art Gallery, University of Glasgow | Rights holder: | Hunterian Museum and Art Gallery, University of Glasgow | Subjects: | SCIENTIFIC COLLECTION : | Source: | Hunterian Museum | Creator: | Hunterian Museum and Art Gallery, University of Glasgow | Identifier: | http://www.huntsearch.gla.ac.uk/cgi-bin/... | Language: | en-GB | Go to resource |
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