Plane diffraction grating with 14
- maker:
- Henry Augustus Rowland
Plane diffraction grating with 14,438 lines per inch ruled on Rowland's engine at Johns Hopkins University on a plate prepared at the Astronomical and Physical Instrument Works of J.A. Brashear at Allegheny in 1890, on oxidised brass mount with circular rack and pinion for rotating grating, and three levelling screws
Details
- Category:
- Optics
- Object Number:
- 1996-305
- Materials:
- brass (alloy), glass and metal
- Measurements:
-
grating: 35 x 45 mm
brass mount: 120 x 110 mm
- credit:
- Epsom College
