Muffling exhaust by turbine wheel: Anon. (Sci. Amer., cxii, No. 3, 63)
- Publisher
- Elsevier Science
- Year
- 1915
- Tongue
- English
- Weight
- 66 KB
- Volume
- 179
- Category
- Article
- ISSN
- 0016-0032
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✦ Synopsis
Vertical Rowland Mounting for Concave Grating. A. S. KING. (Astrophys. Journ., xc, 2o5.)--Details are given of new structural features embodied in the installation of a ~5-foot concave grating on the Rowland plan, but with the plane of dispersion vertical instead of the more usual horizontal disposition. The arrangement permits placing the grating in a pit beneath the laboratory floor, thereby obtaining the constancy of temperature which has proved highly advantageous with plane grating spectrographs. The apparatus is so constructed that it may be operated in a fully-lighted room, and occupies a minimum of floor space. An ingenious arrangement is provided to allow for the variable counterpoise necessary on account of the changing angle of the beam to the vertical.