Bauhaus-Universität Weimar

Titel:
Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine
Person:
Gage, Henry Simon and Henry Phelps Gage
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39438/134/
I 26 
MAGIC LANTERN WITH MANTLE GAS LAMP [Ch. V 
Fig. 68. Upright Gas Burner with Welsbach Mantle and 
Concave Reflector for the Magic Lantern. 
(Front Max Kohl, A. G., Price List No. 50, Vol. I). 
The distance from the condenser giving the best light must be 
determined by experiment, as with 
other extended sources. But, in gen¬ 
eral, it will be found to be at about 
the principal focal distance from the 
first element of the condenser, as 
with the arc lamp, but closer for the 
two-lens than for the three-lens con¬ 
denser § (55). 
§ 205. Reflector.—As with the pe¬ 
troleum light, a concave reflector is 
sometimes used behind the mantle to 
reflect back to the mantle and thence 
to the condenser the light which passes 
backward from the mantle. This is 
not always used, but it would increase 
the light somewhat (§ 210). 
s «_____,. .. , Fig. 69. Inverted Gas Bur- 
§ 206. Connecting the gas supply ner with Welsbach Man- 
with the lamp.—Use for this a perfect TLE FOR THE Magic 
rubber tube or one of the flexible me- {From schm^l^HacnchSca,a. 
tallic tubes (fig. 60), and secure the ^f“0‘).No' IV' PT°iektioH,—Atparu.
        

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