Abstract
Further experiments upon the effect of pressure upon arc spectra have been made with the pressure cylinder (designed by Prof. J. E. Petavel, F. R. S. ) which was employed by the writer in the investigations of the iron and copper arcs, in which an arc is formed between metal poles opposite a glass window through which the light is examined by means of the 21½ feet Rowland grating-spectroscope in the Physical Laboratories of the Manchester University. A system of mirrors allows the image of the arc, however unsteady it may be, to be kept almost continuously in focus upon the slit. Photographs of the silver arc in air have been taken under (total) pressures of 1, 6, 11, 21, 26, 41, 51, 61, 76, 81, 101, 121, and 201 atmospheres, and the results are given below for wave-lengths λλ 4000—4600.
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