NATURAL GAS. 
27 
Similar conclusions have been presented by the United States Geo- 
logical Survey, on pages 645 and 646, in Natural Gas Statistics for 
1916, and in Bulletin No. 120, page 11, of the United States Bureau 
of Mines. 
FIG. 10. TYPICAL NATURAL GAS TRANSMISSION LINE PRESSURE CONDITIONS. 
PRINCIPLES OF NATURAL GAS TRANSMISSION. 
TRANSMISSION IS MORE THAN MERE TRANSPORTATION. 
Continuity of service from the gas sand — usually one-half mile or 
more below the earth’s surface — through the gas main as a continuous 
conduit connecting the gas sand and the consumer’s fixtures, many 
miles away, is a cardinal feature of the delivery of natural gas. The 
general custom of the natural gas business has been to refer to the 
taking of natural gas from the gas sand to the consumer as trans- 
portation. However, the word transmission more correctly expresses 
the actual operation. 
