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Brass quadrant, 1685-1724

IMAGE number
UIS5061660
Image title
Brass quadrant, 1685-1724
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Location
Science Museum, London, UK
Medium
object
Image description

Brass quadrant, 1685-1724. This astronomical quadrant on a wrought iron stand was made by the French instrument maker Michael Butterfield (1635-1724) in Paris. Astronomical quadrants were used to measure the angle of a celestial object from the zenith. Operated in conjunction with a transit instrument, they could be used to check the running rate of astronomical clocks known as regulators. The instrument's orientation in both the horizontal and vertical could be finely adjusted using both the plumb bob and spirit level. Unlike later instruments, the sighting telescope is fixed to the quadrant that pivots at the centre of its graduated radial scale which is marked in degrees. ©SSPL/Science Museum

Photo credit
SSPL/UIG / Bridgeman Images
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Largest available format 2451 × 3504 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 2451 × 3504 px 208 × 297 mm 651 KB
Medium 717 × 1024 px 61 × 87 mm 656 KB

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