jec- of the lamp. tionable, but they may be varied by changing the The demonstrations actually made are illustrated by character of the gas. The remarkable feature of these lamps is that under the proper conditions Fig. 10. Fig. 9. cf temperature and exhaustion they may be ope- Fig. 8. rated by a… … Fig. 13. Fig. 12. Fig. n. 11901 SCIENTIFIC AMERICAN, INC.
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