Q. Why will a room smoke, if there be two fires in it?
A. Because the fiercer fire will exhaust the most air; and draw from the smaller one, to supply its demand.
Q. Why will a chimney smoke if there be a fire in two rooms communicating with each other?
A. Whenever the door between the two rooms is opened, air will rush from the chimney of the inferior fire, to supply the other; and both rooms will be filled with smoke.
Q. What is the remedy in this case?
A. Let a tube be carried from the hearth of each stove, into the external air; and then each fire will be so well supplied, that neither will need to borrow from the other.
Q. Why do vestry chimneys so often smoke?
A. Because the wind (striking against the steeple) is reflected back; and tumbles down the vestry chimney, forcing the smoke into the room.
Q. what winds make vestry chimneys smoke?
A. Those from the north-east or south-east; according to the position of the vestry.