Ag NORMAN SELFE. 
combined as one machine, and Fig. 7 is the diagram from the 
Fig. 7. : 
two cylinders of such machine. The portion hatched with hort 
zontal lines represents the power or force applied by ae eae 
cylinder, and the portion with the vertical lines the resistance © 
the compressor, the area covered by the intersected pare shews 
all the power which is applied directly to its work, that with oe 
horizontal lines shews the power which has to be imparted to t 2 
fly-wheel at the commencement of the stroke, and which is restor 
as per the area with plain vertical lines at the latter part of the 
same. This arrangement entails so much friction and expeps? 
for working parts and heavy flywheels that it has ere 
customary to set the engine of a refrigerating machine at ne 
_ angles to the compressor in order that the power exerted acne: 4 
out the respective strokes may more nearly correspond with the | 
resistance of the compressor. 
One of these machines designed by the author sixteen years 48% 
(Fig. 3) is still at work on the South Coast with vertical engine and 
horizontal compresor, but some of the best machines in the work 
by the most eminent makers, such as the ‘‘Frick,” ‘De LaVergne, 
&c., are arranged with horizontal engines and vertical compressors- 
In other machines, as the “Linde” and “Hercules,” the engine and 
compressor are two entirely separate machines on separa 
