CRANE. | Economy of Mining Operations. 349 
They will, however, give an idea of the relative cost as com- 
pared with the Cornish method of pumping. Below is item- 
ized the cost for a pump with a capacity of 50 gallons per 
minute, 23-inch suction, and a 2-inch discharge : 
[No. 1.] Lift, 150 feet. | 
WaborstwoOsmenwati2 perGaynn- cise os eae nee cs $4 00 
CoODUBGW OBCONS eat PaeA Di hin ee eA te ON iene wih sees tke ve oye 4 50 
Bulb ricantsw creer cess eer ren seu tes ic Men Gal Maes INE oc 10 
JP ENCIIN OVE a las Bg ace AE ae Sa RIOR tI ae A ne 05 
Water tfor boiler; at/40) cents) per tank. .)......4......- 20 
AION EEN eS Gs Geer a ORO ES Ce ROE arched 0 eg eg $8 85 
The cost of pumping for one day (twelve hours) would 
then be $8.85. The pump lifted 72,000 gallons per day, 
giving .0118 of one cent per gallon. 
[No. 2.] Steam pump with a capacity of 38 gallons per 
minute, a 23-inch suction, and a 2-inch discharge, gives the 
following data: 
Lift, 175 feet. 
TaborsonemmMan wath apen Cayman ree nebiene ocr in. $4 00 
Coalmonelandzone-halistonswratioceconweeie erie ee a Bl 
GUD TACAMES PR ee emery Pt Gt Ole ot em eel ai 10 
IEC eH Oey Ge ae SR ot Nr Aton SN UE Seas cc es LR crs ec Gs 05 
Witter ehOnIOOll ein er eee ors. stiet o es oldie ae ie hk 15 
MOLEC OS DELACEA ia caret aes aebaists Aone bee sinosatn $7,67 
The expense per hour would then be 7.67 cents. The pump 
lifted 54,720 gallons per day, which would make .01401 of 
one cent per gallon. 
[No. 3.] Capacity of the pump, 50 gallons per minute, 
with a 3-inch suction and a 24-inch discharge. 
Lift, 150 feet. 
IL@loore, WO TM, Ane SIL {NIP CARY. Gocuocnocoa0coucocGds $3 50 
Comet wWORtONSatapceZarnryaa amen ie rh iiie eo sGkce oe 4 50 
EGG] OVEKCR WOES) «oe lye SIRG GS ete ONE OS See RS SE 12 
TP eay CNN AYERs O59 sic. 'o, lie acl ee Meee RAs Be SAN eae rele UE EEA TNS Bae 10 
Aft ts Taha aun ie Me pO MONS UN SAL OGRE ayia ids oh, anc con anid asfavthe aie 4 30 
MotalecostepemdayAnce rie cesta owes oes Ste ias aime oe $8 52 
The expense per hour would then be 8.52 cents. The 
pump lifted 72,000 gallons per day, which would make .0118 
of one cent per gallon. 
Averaging the cost per gallon as obtained from the cases 
above, we have .0125 of one cent per gallon, which, compared 
with the cost of pumping per gallon with the Cornish pump, 
shows a cost of .007 of one cent more per gallon by steam. 
In most cases where steam pumps are employed, the steam 
