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or workshop, which gardeners call a &lsquo;tambour;’ we shall always advise to place the apparatus in the place which precedes the house, and content ourselves with the pipes for heating the house or houses, because the same apparatus is capable of heating several during the severe cold. The smallest apparatus could easily heat 100 mètres of pipes. Some dissatisfied minds object that this apparatus does not contain sufficient water about the fireplace, because, up to the present time, they have seen enormous boilers, and they think it is the size that gives power. Experiment has demonstrated that a huge quantity of water about the firegrate is useless, and that with a less volume of water a circulation is better kept up, because