140 CEMENTS, LIMES, AND PLASTERS. 



The hardening cylinder, according to Peppel, should be constructed 

 of | to f inch iron or steel plate. The cylinder is bricked in to prevent 

 radiation and has one removable end or head. This head "should 

 be handled by an overhead crane or a block and tackle. Hinged doors 

 with a wheel on the bottom and a track for the wheel to run on have 

 been used. These are clumsy affairs to move and occupy much 

 space, and should never be recommended. The bolts should be so 

 fastened to the cylinder that the head can readily be swung into place. 

 These bolts are usually 11 to 1 inches in diameter". The cylinder 

 varies in length from 35 to 67 feet, and in diameter from 5 to 7 feet. 



Costs of plant and manufacture. The^ following estimates of cost 

 of plant and production are given by Peppel: * 



COST OF PLANT FOR 40,000 BRICK PER DAY. (PEPPEL.) 



Land and buildings $15,000 



1 wet-pan 1,000 



1 ball-mill 500 



2 presses 4,400 



2 pug-mills 800 



Conveyors 6,000 



Shafting and belting 3,000 



1 100-H.P. Corliss engine 2,500 



2 100-H.P. boilers 2,000 



1 25-H.P. boiler 300 



4 hardening-cylinders T X 60' 8,000 



Erecting and insulating cylinders 1,000 



Pipes for preliminary heating 1,000 



Railroad tracks, etc 4,500 



$50,000 

 COST OF MANUFACTURE, 40,000 BRICK. (PEPPEL.) 



Sand: 157 cubic yards at $0 .07 $11 .00 



Lime: 11 tons at $4.00 44.00 



Coal: 3 tons at $2.25 6.75 



Repairs 5.00 



Oil and grease 3 . 00 



Labor: 40 men at $1.35 54.00 



Foreman at $2.50 2 . 50 



Office expenses 20 .00 



Depreciation and interest, 12 per cent 20 .00 



$166.25 

 Selling expenses, 10 per cent , 16 . 00 



$182.25 

 Cost of brick per thousand $4 . 55 



* Trans. Amer. Ceramic Soc., vol. 4. 



