86 Bulletin 86 



first removed, then the outside forms, and a light galvanized ring is 

 slipped onto the top edge of the bell, as otherwise its weight might 

 cause the bell to slump off. The pipe is then left standing on its 

 bottom ring for at least a day. 



The pipe making crew at Glendale was composed of eight men. 

 Only one man, the foreman, came with the machine, and great diffi- 

 culty was had in breaking in green men, especially since the force 

 kept changing. The best day's record of pipe making was 722 feet 

 of 15-inch pipe, and the average day's run was from 575 to 600 feet. 

 The pipe was cured in an open yard and was kept wet for seven 

 days. It was hauled over rough roads to the line of trench but 

 there was practically no breakage. Tests were made on about 100 

 specimens in a frame quite similar to that shown in Fig. 24. With 

 the full pressure from the city main, about 30 pounds, none of the 

 pipe broke and none of them showed any seepage, save a few small 

 spots that became moist. The pipe were inspected carefully. A 

 few, perhaps one percent, were rejected on account of burnt in- 

 terior surfaces, short bells, or cracks, most of the cracks being at the 

 spigot end. 



THE ALLEN 



The Allen machine has a revolving table and a tamper. Both in- 

 side and outside forms rotate with the table. The machine is de- 

 signed for sizes from 3 inches to 24 inches in diameter. About six 

 of these machines have been built, two of which have been in use at 

 Phoenix for se\'eral years. It is understood that no more of these 

 machines are being built. 



THE SANDERS 



More recently two more pipe machines have been put on the 

 market in southern California. One is the Sanders, built by the 

 Pomona Manufacturing Company and the other is built by Kellar- 

 Thomason Company of Los Angeles. 



The Sanders pipe machine has a steel frame work, the base of 

 which is only 4 feet by 8 feet. This frame is mounted on four small 

 wheels, so that the machine can be shifted around in the pipe yard 

 or can be moved readily from one job to another. A 6 horsepower 

 distillate engine is mounted on the back end of the frame and is 

 belted to the main shaft located at the top of the frame, directly 

 above the front end. The vertical packer rod is driven from the 

 main shaft by beveled gears. The weight of the machine is ap- 

 proximately 1800 pounds and a 6-horsepower engine weighs about 

 1000 pounds additional. 



