102
MAGIC LANTERN WITH THE LIME LIGHT (Ch. IV
time smaller cylinders with the gas at a much higher pressure (ioo
to 120 atmospheres) are employed (see also § 156). In using the
gas it is drawn off through a reducing valve by which it can be
delivered at any pressure desired, and of course in any volume
desired.
One should never try to use the gas without drawing it through
the reducing valve. The cylinders have special junctions for the
reducing valve, so that it is easy to make the connections.
Fig. 57. Oxygen Cylinder
with Com pressed Oxygen,
The Pressure Gauges and
the Mixed Jet or Burner.
[Catalogue of Schmidt and »j
Ilaensch). *"
B Tip of the nozzle of
the mixed jet.
K Holder for the lime.
Tine end of the lime is used,
not the side as in fig. 56, 59.
G Handle of the stop-cock
for hydrogen in the tube of
the burner.
S Stop-cock for oxygen.
II The tube conveying
hydrogen to the burner, steel
cylinder not shown.
0 Tube conveying oxygen from the steel cylinder to the burner.
J The high pressure gauge giving the number of atmospheres under which
the gas in the cylinder is compressed.
M The low pressure gauge to show the pressure of the gas after it has
passed the pressure reducing valve (St.).
St The handle of the valve serving to open the pressure reducing apparatus.
V The valve of the cylinder. This must be opened to allow the compressed
gas to escape into the tube passing to the reducing valve and to the high pres¬
sure gauge. It must be closed after every exhibition.