of ventilation. Tall chimneys are useless for this mixture: 100 parts sulphate of sodium, 104 parts of car- the purpose of ventilation without heat when the difference bonate of calcium, and 39 parts of coals. the ventilating flues are, in the majority of cases, either entirely dead or with a… … that when the wind is not strong enough to run the fan, the used but very sparingly, the soda salts contain only from THE WING VENTILATOR. peculiar. form of the cowl, its enlarged size, and prompt 2 to 10 per cent of caustic soda. The first rotating fur- action in shifting itself to windward, will…
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