RULES FOR INVENTION. 



Ill 



II. Considering the principles, what is the best plan in theory *Jg* »** 

 for warming a room ? . Practical re- 



I. We must contrive the fire to spend all its heat to warm J*W. 



1 I. Employ the 



the air as it comes in the room. whole heat ia 



II. To retain the warm air in the rooms, and let the warming the 



... a!r - 



coldest out first to obtain a ventilation. U p re vent it» 



IH. Make the fire in a lower ruom, conducting the heat escape, and 

 „ ii- .l i i ventilate by- 



through the fl x>r into the upper one, and leaving another hole escape o[ ^ld 



for the cold air to descend to the lower room. air. 



IV. Make the room perfectly tight so as to admit no cold and vem -™te 

 air, but all warmed as it comes in. several apart- 



V. By stopping up the chimney to let no warm air escape up "y n [, s eat the 

 it, but what is absolutely necessary to kindle the fire, a hole of air as it come* 

 two square inches will be <»utf : ,cient for a very large room. y 'i imit the 



VI. The fire may be kindled by a current of air brought aperture of the 



from without, not using any of the air already warmed. If this Sjt 1 ™, 11 ^ the 



theory, which is founded on true principles and reason, be com- combustion 



pared with common practice, the errors will appear the dis- w, . l | 1 a,r iroax 

 r r ■ k without, 



advantages of which may be evaded. Experiment 



III. I had a stove constructed to put the theory as fully in or trial, 

 practice as possible, and have found all to answer according to 



theory. A stcve de- 



The operations and effects are as follows, viz, scribed m ge- 



,. ^ ... , icral terms. 



I. It applies the fire to warm the air as it enters the room, 



and admits a full and fresh supply, rendering the room mode- 

 rately warm throughout. 



II. It effectually prevents the cold air from pressing in at 

 the chinks or crevices, but causes a small current to pass out- 

 wards. 



III. It conveys the cold air out of the room first : — conse- 

 quently, 



IV. It is a complete ventilator rendering the room healthy. 



V. The fire may be supplied in very cold weather by a 

 Current of air from without, that does not communicate with 

 the warm air in the room. 



VI. Warm air may be retained in the room any length of 

 time at pleasure ; circulating through the stove, the coldest 

 entering first to be warmed over again. 



