. The Street railway journal . IP 4p J 155 §5* 5* 2™ is5 30* 5* Time FIG. 11.—CURVE SHOWING TIME AND PRESSURE REQUIREDFOR VARIOUS APPLICATIONS OF SAND BLAST it then falls less rapidly, due to the supply of air from the com-pressor, until the application ceases, when the compressor atonce starts to charge up the reservoirs, and continues to do sountil the governor cuts it out of action. The table on page 1105 shows the results noted in eighteendifferent applications. The approximate area cleaned in squareinches was obtained by measuring a number of spots where thebonds were to be applied. They
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. The Street railway journal . IP 4p J 155 §5* 5* 2™ is5 30* 5* Time FIG. 11.—CURVE SHOWING TIME AND PRESSURE REQUIREDFOR VARIOUS APPLICATIONS OF SAND BLAST it then falls less rapidly, due to the supply of air from the com-pressor, until the application ceases, when the compressor atonce starts to charge up the reservoirs, and continues to do sountil the governor cuts it out of action. The table on page 1105 shows the results noted in eighteendifferent applications. The approximate area cleaned in squareinches was obtained by measuring a number of spots where thebonds were to be applied. They were found to measure from3^2 ins. to 4 ins. long and from 2 ins. to 2^2 ins. wide, and were. j Blast Operating . Blast not Operating ) 350 Jou TTo 420 430 J5u J3u m Time FIG. 12.—LENGTH OF TIME REQUIRED PER APPLICATION ANDCHANGE IN PRESSURE FOR ONE HOURS RUN OFTHE SAND-BLAST not quite elliptical in form. From these eighteen applicationsthe average number of kw-hours per square foot cleaned isabout 2.565. As each bond requires the cleaning of about 20sq. ins., 1 sq. ft. will cover the requirements for seven bonds;so that at this rate the kw-hour per bond would be about 0.366. Of course, this figure would vary according to conditions andlocalities, and the extent of such variations can be determinedonly by actual practice, but the above amount readily indicates that for this and similar classes of work, the portable sand-blast outfit is undoubtedly the cheapest to operate, while at thesame time it is most easily adaptable to positions difficult of access. In ordinary operation, the time elapsing between the end ofone application and the beginning of another is often too shor