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132 LANTERN WITH ALCOHOL LAMP AND MANTLE ICn. V
(3) When the torch is in place and wet with alcohol, open the stop-cock from the supply tank (fig. 73 R), and then light the torch. The alcohol flame will heat the burner and stand-pipe, and the alcohol in the stand-pipe will be vaporized and pass over through the small pipe to the burner where it will catch fire and burn. Open the air intake partly. In using the lamp this air intake must be regulated as for a Bunsen burner, the more pressure the more the valve must be opened.
Soon the mantle should begin to glow brightly from the burning vapor in the burner. When this occurs commence to put pressure on the alcohol tank (fig. 73 W). This is done by connecting the pressure apparatus by means of the rubber tube to the alcohol tank, at T, (fig. 73), and squeezing the bulb.
In case the first burning off of the torch does not start the lamp one must burn it off again, but do not add the alcohol until the torch or heater is out, and then use a pipette. Relight the heater and it will almost surely start the lamp.
Do not connect the pressure apparatus until the mantle commences to glow. If pressure were on the alcohol tank at first the liquid alcohol would be forced over from the stand-pipe into the burner and would run down on the torch and upon the table. Remember that alcohol is very inflammable and also very unmanageable \vhen it is on fire, so be exceedingly careful.
(4) As soon as the mantle begins to glow brilliantly considerable pressure can be put on the alcohol tank. The greater the pressure the wider must the air-intake at the burner be opened and the more brilliant will be the light; but as the pressure increases the lamp roars more loudly until, when the pressure is considerable, it roars like a young blast furnace. By watching the results one can avoid the excessive noise, and still get a brilliant light.
§ 217. Management of the exhibition. — This is in general like any other magic lantern, but as the light depends largely on the pressure regulation, one must be careful to keep up the proper amount of pressure during the entire time. Do not expect too much of this light. It gives fairly good lantern-slide images for a screen from two to three meters (six to nine ft.) square. As the