May 4, 1917.

THE COLLIERY GUARDIAN.

867

It speaks for itself

1050

1000

1100

80

60

70



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UJ

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500

■400
X

-300 cd

600	700	800	900	1000	1100

GALLONS PER MINUTE.

IH

Pumping Plant in a Colliery Pumproom 1,050 feet below surface.
Three units each delivering 50,000 gallons per hour to the surface.
Efficiency of Pumps, 79 per cent. Speed, 1,485 revs, per minute.

Motors work at 5,500 volts.

Write for List No, 736

pulsometer engineering C°. U!

OFFICES :	WORKS:

11, Tothill Street,

LONDON, S.W

Nine Elms Iron Works,

READING