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The first Michelson Echelon Grating made in Europe with diffraction grating and 15 plates

The first Michelson Echelon Grating made in Europe with diffraction grating and 15 plates

1899
35-plate echelon diffraction grating by Adam Hilger Ltd.

35-plate echelon diffraction grating by Adam Hilger Ltd.

1930
Echelon spectroscope, with wave length drum (Prism and Echelon grating chipped) by Adam Hilger Ltd., London, England, 1905, comprised of two units: constant deviation spectrometer and echelon grating.

Echelon spectroscope

1905
Replica plane diffraction grating, area 17 x 16 mm, mounted on glass plate: inscription in white ink on black tape round sides of plate reads 'With T. Thorp's compliments / Thorp's Echelon Grating / 1000 grooves to inch'.

Replica plane diffraction grating

1900-1919 (estimated)
Replica plane diffraction grating, area 17 x 16 mm, mounted on glass plate: inscription in white ink on black tape round sides of plate reads 'With T. Thorp's compliments / Thorp's Echelon Grating / 1000 grooves to inch'.

Replica plane diffraction grating

1900-1919 (estimated)
Rectangular echelle reflection grating (10 x 5 inches) on glass substrate (135 x 265 mm) with cardboard box, 300 lines per mm, and 63ยบ 26' ' blaze angle. Made by Bausch & Lomb, Rochester, New York State, USA in 1964, Cat. No. 35-53-32-45. Used at the University Observatory, Oxford.

Rectangular echelle reflection grating (10 x 5 inches) on glass substrate (135 x 265 mm) with cardboard box

1964