Concave Rowland-type diffraction grating on speculum metal, grating area 84 x 53 mm, with faint scratched markings reading 'Ruled by R W Wood and R Canfield / Johns H . . . .' [remainder indecipherable] and with 'Ruled by / R W Wood / and / R Canfield / Johns Hopkins U / April 1926' painted on the back, in felt-lined wooden case.
- Object Number:
grating block: 13 x 110 x 110 mm
case, overall: 30 x 127 x 130 mm
- furnishing and equipment
- tools & equipment
- optical instrument
- optical instrument component
- diffraction grating
- Imperial College of Science,Technology & Medicine (Spectroscopy Group)
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