Electricity experimentally and practically applied; a book for the beginner and for the practical man, principles, experiments, practical applications and problems (1910)
Ashe, Sydney Whitmore · New York, D. Van Nostrand company · leaf 353
Fig. 415. — Experimental Lantern arranged for Vertical Projection. … Fig. 416, — Single Lantern. 332 APPENDIX such a lantern should not be mounted on a separate support, as itinterferes with the use of the vertical attachment. An automatic lamp, Fig. 419, is used with this lantern which can beturned on and off, either at the lantern or at the lecture table.…
Electricity · Electrical engineering
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