Circulating bow yar tube, d, and the valve continue to fall until | ia = We mmparatus, ereee fork Me P . ‘ i \3 || The heating of buildings by hot water is the water in the hold is nearly down to the j E | i level of the mouth, c, of the tube, d, when i | far more healthy than by hot air. Commo-… … discharging the leakage whenever the water avoided. rises above the floating point of the float, B,
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