go Count Rumford’s Enquiry concerning the Nature of Heat , 
large quiet room, to cool ; the air of the room being at the tem- 
perature of 45 0 Fahrenheit. 
Another cylindrical vessel, No. 2, in all respects like No. 1, 
and with its ends covered in the same manner, but with its 
vertical sides covered with a single covering of fine Irish linen, 
(such as is sold in London for about 4.9. per yard,) closely 
applied to the body of the instrument, was filled with hot water 
at the same time, and placed on the same table to cool. 
This experiment lasted many hours ; and, in that period, the 
temperature of the Water, in each of the instruments, was care- 
fully observed, and noted down, a great number of times. 
The result of this experiment (the details of which have 
already been given) was very remarkable. 
While the instrument No. 1, whose sides were naked, employed 
55 minutes in cooling from the point of 94 0 to that of 84°, the 
instrument No. 2, whose sides were covered with linen , cooled 
through the same interval in 361* minutes. 
Hence it appears, that clothing may, in some cases, expedite 
the passage of heat out of a hot body, instead of confining it 
in it. 
Desirous of seeing whether the same covering would, or would 
not, expedite the passage of heat into the instrument; after having 
suffered both instruments to cool down to the temperature of 
about 42 0 , 1 removed them into a warm room, in which the air 
was at the temperature of 62°; and I found that the instrument 
No. 2, which was clothed, acquired heat considerably faster than 
the other. No. 1, which was naked.* 
* The details of this experiment (which was made on the nth of March, 1803) 
inay be seen in page 83. 
