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the bailer. Thus the frictional load is divided between the band wheel and the back brake block.

Several types of steel bull wheel and calf wheel shafts are now quite generally used in California, Wyoming and Texas, of which the Parkersburg, Figs. No. 14 and 15, and Ross and Seely are good examples.

For heavy work the steel crown block with pulleys in iron bearings (Fig. 16) has quite generally superseded the wood crown block.

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In some of the deep fields Carnegie steel bull wheels and calf wheels are used in conjunction with the wood derrick. Minor parts of the derrick, too, are receiving more attention, as evidenced by the accompanying illustration of swing lever irons for the sand reel (Fig. 17).

Deep well drilling is becoming, in increasing degree, an engineering proposition, requiring in all its branches improved mechanical equipment.

NOTE WHEN STRAIGHT FACE FRICTION PULLEY IS USED, THE

SWING LEVER IRONS ARE ON TUG WHEEL SIDE.

WHEN TAPERED FACE FRICTION PULLEY IS USED, THE SWING LEVER IRONS ARE ON CRANK SIDE.

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Fig. 17. Diagram Showing Swing Lever Irons for Iron Sand Reel (The National Supply Co.)

-6 TAIL POST BOX

GK-7

Fig. 18.

DIAGRAM OF CARNEGIE 80-FOOT STRUCTURAL STEEL STANDARD DERRICK

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The Carnegie Steel Co. makes this derrick in three sizes, 64 feet, 72 feet and 80 feet in height Refer to Pages 375-378 for safe working loads for derricks.

STEEL DERRICKS

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Fig. 19. Carnegie Steel Bull Wheels fitted with wood cants for tug and brake.

"

Weight, approximately, 3,600 lbs.

Standard Size-14' 6" over gudgeons, shaft 16" O. D. Pipe, " thick. Weight, approximately, 3,400 lbs.
Deep Well Size-15' 11' over gudgeons, shaft 18" O. D. Pipe, " thick.
Cast iron gudgeons, spoke type, inserted in end and riveted to shafts.

71

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Fig. 20.

2-84"

2:68"

Carnegie Steel Band Wheel, showing diagram of the Band Wheel with Shaft, Crank, Flanges and Sprocket Wheels mounted in Jack Post Boxes secured with Bridle Irons. These Steel Wheels are fitted with wood cants for tug and friction.

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