(1) Low temperature of air during compression.

(2) Increased volume of air per stroke, due to filling of clearance
spaces with water and to a cold air cylinder.

(3) Low temperature of air immediately after compression, thus
condensing moisture in the air receiver.

(4) Low temperature of cylinder and valves, thus maintaining packing,
etc.

(5) Economical results, due to compression of moist air (see table 3).

TABLE 3.--SHOWING THE RELATIVE QUANTITY OF WORK REQUIRED TO COMPRESS A
GIVEN VOLUME AND WEIGHT OF AIR, BOTH DRY AND MOIST--ALSO RELATIVE
VOLUMES WITH AND WITHOUT INCREASE OF TEMPERATURE FROM COMPRESSION.

_______________________________________________________________________________________
| | |
|Compression at |Compression |
|a Constant |with |
|Temperature. |Increase of |
|Mariotte's Law. |Temperature. |
__|________________|__________________________________|________________________________
| | | | | | | | | | | | | | |
1|0.1 | | | | | | 20 | 68 |1.0 | | | 68 | | |
2|0.5 | 7199|1468|0.612| 7932|1618| 85.5|186 |1.222| 733|0.092|111 |3.0|23500|22500
3|0.333|11356|2316|0.459|13360|2725|130.4|267 |1.375|2004|0.150|135.5|4.0|37000|35000
4|0.25 |14260|2909|0.374|17737|3618|165.6|330 |1.495|3477|0.196|153.5|4.8|48500|45000
5|0.200|16580|3383|0.320|21209|4326|195.3|384 |1.595|4629|0.213|167 |5.4|58500|52500