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85 



the forms arc filled, the inner form is withdrawn and the outside 

 form with the tile is taken away on a wheeled carrier. On the older 

 machines the inner form was withdrawn downward, but in the latest 

 models it is pulled upward. The older models have two tampers ; 

 the later models, one. The range of pipe sizes is from 4 inches to 

 30 inches in diameter on the largest of the three sizes of machines. 



The pipe machine used at Glendale recently is a Hammond. Its 

 construction is shown in Fig. 10. A vertical shaft is concealed in the 

 heavy cast iron standard. 

 This shaft operates the 

 tamper which is carried 

 on a swinging arm. At 

 the bottom is a horizontal 

 shaft which drives the 

 vertical shaft and rotates 

 the table on which the 

 pipe is made. This shaft 

 carries a winding drum, 

 also, by means of which 

 the inside form is with- 

 drawn upward. The hori- 

 zontal shaft is driven by 

 a quarter-turn belt from a 

 jack shaft above, and the 

 jackshaft is driven from 

 the main shaft which also 

 drives the tw^o-sack batch 

 mixer and the endless 

 belt elevator. A 20-horse- 

 power electric motor fur- 

 nished the power at Glen- 

 dale. 



The outside forms are of heavy steel, in halves, held with screw 

 clamps. The inside form is a long cylinder with surface well pol- 

 ished by the rubbing to which it is subjected when a tile is being 

 made. The Thomas-Hammond machine has been used mostly for 

 bell-ended pipe and the Glendale specifications required bell and 

 spigot joints. When the body of the pipe has been tamped full, a 

 special form to make the bell is put in place, and the tamping is then 

 continued. The pipe rests on a cast iron ring with three blunt feet. 

 When a fresh pipe is wheeled to the curing space the bell form is 



Fig. 10. — The Thomas-Hammoncl pipe machine. 



