IV.Very High-Pressure Compressors.-Compressors belonging
under this division are not largely employed for industrial purposes.
They are utilized for compressing air to a great degree in small
reser. voirs, such as are carried by divers, when the latter take
with them their own air-supply, instead of depending on pumps
at the surface. They are also used for compressing gases in cylinders
which are delivered to consumers, for the oxyhydrogen light etc;also
for filling the air-reservoirs of compressed-air locomotives and
of torpedoes, and for forcing air into gaseous waters.