Ventilation. 19 



way, and that by some of the various machines con- 

 structed for the purpose. 



In addition to this, I would have at least eight ven- 

 tilators on the north side of a house 125 feet long, if con- 

 tinuous ventilation is not used on this side. These 

 can be made in the form of sash, and of varying sizes, 

 according to the size of glass used. Hinge these at 

 the ridge and they will be found exceedingly conven- 

 ient in airing when the wind is blowing from the south, 

 also for maintaining a low summer temperature. As 

 these ventilators will rest on the top of the bars, they 

 can be made wind-tight by fastening a continuous 

 piece of quarter round on their under surface, in such a 

 manner that when shut, the round will be inside the 

 opening, thus covering any crack or opening made by 

 the warping or springing of the ventilator. It not be- 

 ing necessary to use these small ventilators as often as 

 the main ones, it is optional with the builder as to the 

 best way of raising or lowering them. If it is not 

 deemed desirable to run two lines of shafting, they can 

 be opened and closed in the old way, by means of an 

 iron lift, in which holes have been made at varying 

 distances. But whatever the method, I would not be 

 without them, as they are needed from July to Novem- 

 ber. Still another and a better way — if it can be af- 

 forded — is to have continuous ventilators on each side, 

 making each ventilator of a suitable width to receive 

 one light twenty inches long. Hang these at the ridge 



