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I observed that the flame was singularly changed. It ap™ 
peared larger, whiter and more brilliant. The vast impor¬ 
tance of these results will be readily perceived. I feel 
great pleasure in communifcating them to the public, and 
only desire that every individual will content himself with 
profiting by them, without depriving others of the same 
liberty. 
It will be readily perceived that this cylinder formed wick, 
open at one side, may be used with advantage in lamps 
of all sizes. The quantity of oil consumed, as well as of 
light diffused, will always be in proportion to the diameter 
of the wick-pipe. A portable lamp, for example, having 
one nine lines in diameter, and a wick sixteen lines in 
breadth, will diffuse as much light as an Argand’s lamp of 
the largest size. But for domestic use, one that is able to 
afford the light of four candles, will be sufficiently power¬ 
ful, and when this quantity of light can be diminished at 
will by lowering the wick, without loss of oil and without 
smoke or odour, and in addition to all this the whiteness of 
the flame not affected ; it appears to me that every thipg to 
be desired in the constitution of a lamp has been attained. 
NOTE. 
The following are the dimensions of the most essential 
parts of an extremely well finished portable lamp, now in 
my possession. Diameter of the lamp-supporter, sixteen 
lines. Height, eight inches four lines. Greatest diameter 
of the circular reservoir at its lower part, two inches eight 
lines. Length of the handle, five inches, depth of the han¬ 
dle nine lines. The handle and reservoir contain 116 
grammes of oil (3.86 ounces). Depth to which the lamp 
glass is fastened on the supporter, fourteen lines. 
