818 BOARD OF AGRICULTURE. 



will warm the air in ventilator, and produce a strong upward 

 current: at the same time, air as fresh and pure as can be 

 obtained may be admitted from out of doors, sufficient to 

 furnish each occupant of a room with from fifteen hundred 

 to two thousand feet per hour, or in sufficient quantity to 

 keep the inside free from impurities that can be detected by 

 the senses of those who may enter the room from the outside 

 open air. 



This may be accomplished, in such a manner as to avoid 

 disagreeable and dangerous currents, by lowering the upper 

 sash of the window, having a thin, narrow strip of board so 

 attached as to direct and diffuse the inflowinjj current through 

 the upper air of the room ; or the lower sash may be raised 

 three inches, and a piece of board or thick stuff fitted to fill 

 the space under the sash : this will allow air to enter freely 

 through the opening at the middle of the window, with an 

 upward current. An additional supply can be secured by 

 having the thick piece of lumber used to fill under the sash 

 so made as to project an inch and a half inside the lower 

 border of the sash; then perforate with three-fourths inch 

 augur-holes bored horizontal from the outside nearly through 

 to meet perpendicular holes from the inside opening just 

 within the sash. A slide can be adjusted to close the open- 

 ings, when desired, and the style of construction and work- 

 manship widely varietl to suit individual notions. 



These devices, though simple, are very effective. The 

 inflowing currents are given an upward direction, and so 

 broken as to prevent discomfort, annoyance, and danger 

 from taking cold. 



To maintain a temperature at sixty-five or seventy, with 

 snch a constant renewal of the air, will require a larger 

 expenditure for fuel : so the question of ventilation and pure 

 air often resolves itself, in the mind of a calculating Yankee, 

 into one of dollars and cents; and he will question and doubt 

 the expediency, economy, and necessity of the outlay, and 

 neglect or refuse to secure for his family the blessings of 

 this sanitary essential, pure air. 



Very likely he will put on double windows, and fill up 

 every crack admitting fresh air, heat one living-room with a 

 close iron stove, and wonder why his wife should suffer so 

 constantly with headache and nervous irritability, — weak, 



