PROJECTS 595 



has a large mouth and may be easily washed and sterilized ; if it 

 breaks, a duplicate may easily be had. 



An insulated bottle may be made by using a round cardboard 

 cereal carton for an outside container, newspaper for nest and pad, 

 and an ordinary wide-mouthed bottle with a tight cork for a liquid 

 container. Before pouring hot liquid into such a bottle, be sure 

 to heat the bottle by submerging it in cold water and bringing the 

 water to a boil (pp. 65 and 66) . 



PROJECT XXIV. How to Humidify Indoor Air in Winter, 

 page 107 



The air in kitchens and bathrooms is generally plentifully supplied 

 with moisture. Other heated rooms ordinarily require the addition 

 of considerable moisture to the air. 



In case a room is heated by stove, keep a pan of water continuously 

 on the stove. 



Modern hot-air furnaces are furnished with water pans to supply 

 moisture to the air. If your furnace has no such moisture supply, 

 you will have to contrive a humidifier best suited to your needs. 

 Where floor registers are used, it is sometimes possible to set a pan 

 just under the grating and keep it filled with water. If this cannot 

 be done, it may be necessary to adapt the principle illustrated in 

 Figure 53 of the body of the book to a humidifier, which may 

 be put in some inconspicuous place in the room. Of course, the 

 nearer it can stand to the warm air draft, the more rapidly the water 

 will evaporate. 



For rooms heated by steam or hot water, have a tinsmith make a 

 galvanized iron water can of the general shape indicated in Figure 

 16. The length, breadth, and thickness of the can will depend on 

 the amount of space available between the wall and the radiator. 

 At most it need not have a capacity of more than 2 gallons. 



On one of the broad faces of the can solder. two No. 10 galvanized 

 iron wires, as shown in Figure 16, A A. Curve the ends of these 

 wires so as to hang them over the connecting rod of the radiator 

 as means of support. The distance between the wires must be such 



