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Thorps replica grating (2 1/8 x 1 3/8-inches) on glass (2 1/2 x 2-inches) of Rowlands metal diffraction grating

Concave Rowland diffraction grating on speculum metal

1894

Concave Rowland diffraction grating on speculum metal

1898

Plane Rowland diffraction grating on speculum metal

1895-1909 (estimated)

Concave Rowland diffraction grating on speculum metal

1899

Concave Rowland diffraction grating on speculum metal

1894

Concave Rowland-type diffraction grating on speculum metal

1882-1899

Concave Rowland-type diffraction grating on speculum metal

1882-1909 (estimated)

Concave Rowland-type diffraction grating on speculum metal

1926, April

Concave Rowland diffraction grating on speculum metal

1882, Nov 6
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

Plane diffraction grating with 14

1890