Concave Rowland-type diffraction grating on speculum metal

Made:: 1882-1909 (estimated) in Baltimore and Allegheny City

maker:: Henry Augustus Rowland

$Concave Rowland-type diffraction grating on speculum metal$

This image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print

License this image for commercial use at Science and Society Picture Library

Concave Rowland-type diffraction grating on speculum metal
Science Museum Group
© The Board of Trustees of the Science Museum

Concave Rowland-type diffraction grating on speculum metal, grating area 130 x 75 mm, with bevelled glass cover plate in heavy aluminium case. Unsigned, but similar gratings made by Brashear and Rowland. Typescript label reads '15,000 lines per inch, / right extreme 1½" defective'.

Details

Category:: Optics

Object Number:: 2000-1446

Materials:: speculum metal and metal, cast

Measurements:: grating block: 19 x 160 x 133 mm
metal case, overall: 52 x 200 x 185 mm

type:: diffraction grating - reflection

credit:: Imperial College of Science,Technology & Medicine (Spectroscopy Group)

Cite this page

Rights

We encourage the use and reuse of our collection data.

Data in the title, made, maker and details fields are released under Creative Commons Zero . Descriptions and all other text content are licensed under a Creative Commons Attribution 4.0 licence

Using our data

Download

Download catalogue entry as json

Download manifest IIIF

Our records are constantly being enhanced and improved, but please note that we cannot guarantee the accuracy of any information shown on this website.

Concave Rowland-type diffraction grating on speculum metal

Details

Related Objects

Pair of plastic National Health Service spectacles

Telescope by John Yarwell.

‘Visual glasses’ designed by Benjamin Martin

Telescope by Christopher Cock

Handheld reading lens and case

Telescope by John Marshall