THE PELTON AND SIMILAR TYPES 91
is inclosed with the motor wheel and operates within the vapor
contained in the casing. The three reasons for this are: (1) That
he believes the wheels will wear better when steam lubricated;
(2) that noises, if present, will be abolished; (3) that by this construction packing glands on the spindle of the motor wheel may be
The journals for the wheel spindles are to be hardened and ground, mounted in pivoted split shells of cast iron, and like the gearing, exposed to the vapor of the wheel chamber, which is at low pressure. abolished.
Fig.16.Turbine Patented by John Richards.
Mr. Richards is an advocate of simple impulse wheels with gear
such types are more cheaply constructed
because
transmission,
than elaborate compound turbines. In his paper before the Tech-
nical Society of the Pacific Coast, already referred to, he gives
numerous examples within his experience, of high speed gearing and rapid running machinery, which have given service during long periods of time.
Levin's Turbine. In 1904 a turbine was patented by A. M. Levin in which the steam is expanded completely in a nozzle before impinging against the buckets of the wheel and then is used several times in succession upon the blades of the same wheel.
