- Item type
- Object
- Dimensions
- Height: 142mm Width: 98mm
- Inventory No
- 15095
- Accession Number
- 1966-123
Description
Two samples of grating. Cellophane grating. Replica of diffraction grating in cellulose acetate, one is 14438 lines per inch and the other is 1400, both taken from an original grating by Rowlands 1880 at Baltimore USA. Both stored in a paper envelope with card supports. One is a circular grating and the other is rectangular.
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