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Portable transit instrument, 1840-1860

IMAGE number
UIS5061793
Image title
Portable transit instrument, 1840-1860
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Location
Science Museum, London, UK
Medium
object
Image description

Portable transit instrument, 1840-1860. This portable transit instrument with a cast iron stand was made by the London instrument makers Troughton & Simms. It was used, in conjunction with a very accurate clock, to find the celestial longitude of stars known as the 'Right Ascension'. In operation, the instrument was oriented so that the telescope was aligned with the north-south meridian. Star positions were then measured by noting the time when the star moved across the east-west cross-wires in the telescope eyepiece. To make observations easier, the small lamp on the right was used to illuminate the eyepiece and a small mirror in the middle of the tube directed the light downwards towards the eyepiece cross-wires. ©SSPL/Science Museum

Photo credit
SSPL/UIG / Bridgeman Images
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Largest available format 2506 × 3504 px 1 MB
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