February 15, 1918.

THE COLLIERY GUARDIAN.

319

By Tests The Best

ACTUAL RESULTS OF TRIALS

INCREASE IN EVAPORATION.

These tests were carried out at one of the largest Collieries in the United Kingdom.

“PERFECTA” BOILER CIRCULATOR Ltd., 39, Victoria Street, LONDON, S.W. 1.

NEWtyp*‘SPECIAL’ PUMP.







Less Steam Used
No Outside Pipes
Much Simplified.

3



TANG YES LT° BIRMINGHAM.

No. 422 D.