. The Bell System technical journal . s economized and the pump is located considerably lower thanwould otherwise be the case, thus resulting in a reduction of thesuction lift for the water between its level in the manhole and thepump impeller. Air Compressors and Compressed Air Tools Of the many applications for mechanical equipment to offset thescarcity and high cost of certain types of labor such as for excavating,etc., the use of air compressors and compressed air tools is of primeimportance in the outside plant construction work. Through specialadaptations to meet each peculialr condition
. The Bell System technical journal . s economized and the pump is located considerably lower thanwould otherwise be the case, thus resulting in a reduction of thesuction lift for the water between its level in the manhole and thepump impeller. Air Compressors and Compressed Air Tools Of the many applications for mechanical equipment to offset thescarcity and high cost of certain types of labor such as for excavating,etc., the use of air compressors and compressed air tools is of primeimportance in the outside plant construction work. Through specialadaptations to meet each peculialr condition, this class of labor savingequipment has been made available for use on such jobs as the opening 72 BELL SYSTEM TECHNICAL JOURNAL of all kinds of street pavements preparatory to laying undergroundconduit, cutting frozen ground, loosening the earth in excavatinginstead of using picks, drilling rock preparatory to blasting for under-ground conduit or for pole holes, tamping back filled earth, cuttingiron pipe covering from cable, Fig. 20—Air Compressor Mounted on Trailer for Maximum Portability Fig. 20 shows a new type of portable gasoline engine driven com-pressor unit which is being satisfactorily used for the larger jobs ofopening street pavements, for rock drilling, etc.
Size: 2118px × 1179px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
