Original mirror for William Herschel's forty-foot telescope, 1785.

The first 48-inch speculum mirror cast with metal cover by Sir William Herschel in 1785 for his 'Forty Foot' telescope at Slough, England.

Collection

Science Museum

Inventory Number

3020166

Title

Original mirror for William Herschel's forty-foot telescope, 1785.

Object Type

PhysicalObject

Measurements

- overall (including ring): 150 x 1260 x 1260 mm