(1) Use as pure water as your locality affords. (2) Clean and scrape your boiler as often as you possibly can. (3) Blow off without excess. (I) In case of salt or brackish waters, never use steam of over 90 lbs. pressure to the sq. in. (5) In case of sulphate of lime waters, never use steam of over 70 lbs. pressure, (6) In case of water holding carbonate of lime in solution, pass it through a feed-water heater made hot by exhaust steam or waste heat. (7) In case of muddy waters use large feed-water cisterns or reservoirs, on the bottom of which the suspended earthy matters will soon form a soft deposit, when the surface water can be drawn off for

When using hard water, save the drippings of the exhaust-pipe, and the condensation of the safety valve blow-off, and from the cylinder, and use the water thus obtained to fill the boiler after blowing off The result will be surprising in its effeet in loosening scale.