of the prominence as seen in Fig. 1 toppled back to the sun, forming the strument called the spectroheliograph. This was de- spot is central on the sun, we may look for an auroral loop in Figs. 2 and 3. Fig. 4 shows the flame in rapid display. Northern lights are rather elusive phenomena, vised by… … 2.-10:52 A. M. Height 114,200 miles. In principle the Instrument is a spectroscope, but with the addition of a second slit placed:close in front of the 1.-10:02 A. M. Height 100,700 miles. 3.-11:01 A. M. Height 123,200 miles. photographic plate. The second slit cuts off all but that portion of the…
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