Profile gauge with concave profile

One of two profile gauges with concave profile which was used by the 3rd Earl of Rosse to measure the 72 inch mirrors used on the largest Rosse telescope.

Details

Category:
Astronomy
Object Number:
1914-372/1
Materials:
iron, pine and complete
Measurements:
overall: 70 x 1860 x 35 mm
type:
optical testing instruments and gauges (mirror)
credit:
Lord Rosse (5th Earl)