. Dr. Evans' How to keep well; . &* WN ON. Virginia Health 490.—Specifications for Kentucky Type Septic Tank. Reply.—M. H. E. is right. The amount of water that can be evapo-rated from an iron can is far from being enough. I bought for my radiator 1206 VENTILATION—HEATING—HUMIDITY a wood wheel air valve at a quarter or thereabouts. I screwed off thesmall valve on the side of the radiator and screwed this on its place. WhenI want to increase the humidity I turn the small wooden wheel and steamblows into the air. When there is enough I turn it off. The objection isthe noise it makes.
. Dr. Evans' How to keep well; . &* WN ON. Virginia Health 490.—Specifications for Kentucky Type Septic Tank. Reply.—M. H. E. is right. The amount of water that can be evapo-rated from an iron can is far from being enough. I bought for my radiator 1206 VENTILATION—HEATING—HUMIDITY a wood wheel air valve at a quarter or thereabouts. I screwed off thesmall valve on the side of the radiator and screwed this on its place. WhenI want to increase the humidity I turn the small wooden wheel and steamblows into the air. When there is enough I turn it off. The objection isthe noise it makes. The engineers say that if everybody did this thejanitors would be compelled to watch the water in the boilers more closely. There are several methods in use designed to overcome the short-comings of this simple arrangement. In one group are the silencers de-vised to prevent the noise. Another apparatus is one to prevent the lower-ing of the water in the boiler. At the Lane Technical High School (Chicago) the engineer, Mr. Stoltz,
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