The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular (1877)

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158 SCIOPTICON MANUAL. unsound place in the lime, it sometimes produces a his- sing sound. Moving the lime or varying the pressure will, in most cases, abate the annoyance. MARCT'S TRIPLE JET. In this apparatus, the three burners already described are interchangeable. Fig. 40. Fig. 40 represents the house gas-burner in position, while Nos. 1 and 3 are in the cells d and e, to be shut in by the cover/. The broach in the cell v is in proper