Volltext: Optical Projection: A Treatise of the Use of the Lantern in Exhibition and Scientific Demonstration

General experience, however, does not go in the direction 
of any triple dissolver, but prefers an ordinary bi-unial dis¬ 
solving tap for a pair of the lanterns, and a separate four-way 
tap (fig. 67) for the other one, which turns on or cuts off both 
gases as required. 
A very usual plan 
is to have pieces 
of brass tubing 
pluggedat the top, 
fixed up each 
comer of the back 
of the lantern, cut 
where the top 
lantern joins on, 
but connectedwith 
an inch or two of rubber so as to act as one. The supply- 
tubes are stretched over the bottom ends of these pipes, and 
small side nozzles level with the dissolving taps connect with 
these. Rubber tubes connect the dissolving taps with the 
jets as usual. This is decidedly the most popular plan ; 
but some experienced exhibitors prefer for each lantern to 
have its own single four-way tap, governing its own jet alone, 
supplied from brass mains as in the preceding case. Each 
tap has a double arm (that is, one extending on each side of 
the plug), and the upper pair of arms are connected by a 
brass rod on one side, and the lower pair by a rod on the other 
ends. The rods pass through sockets with pinching screws 
fixed on the arms, so as to work any given arm at pleasure, 
or slide loose when the screw is slackened. The result is 
that either the top pair or bottom pair of lanterns can be 
dissolved together at pleasure, the third being left independent 
for separate use. Or the pairs can be changed in a moment 
from top to bottom pairs if required. 
66. Bi-unial and Lantern Effects.—A bi-unial lantern is 
necessary for many other effects than dissolving views, as


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