172 Means of Producing Light, &. 
11. Means of Producing light, &c. 
Extract of a letier from Prof. Ropert Hare, M. D. of Phi- 
9. 
ladelpia, to the Editor, dated Dec. 30, 181 
I believe I mentioned in a letter to you last summer, that 
i had rendered the flame of Hydrogen luminous|ike that of 
oil, by adding a small quantity of oil of turpentine to the 
usual mixture for generating that gas.* When the ingredi- 
ents are at the proper temperature, the light is greater f 
_ think than that produced by Carburetted Hydrogen. 
Ihave lately found that the addition of about 3, of the 
same substance to alcohol will give this fluid the property of 
burning with a highly luminous flame, and that there is a 
certain point in the proportions at which the mixture burns 
without smoke like a gas light. 
his observation may be of use where spirits are cheap, 
as in our western states, and even in the northern parts of 
the Union where it is made from potatoes. 
It might be serviceable to morals if the value of this arti- 
cle could be enhanced by a new mode of consumption. 
It is in my power to send you a drawing and engraving of 
what I call the caloriphorus, by analogy with Volta’s Elec- 
trophorus. In this there is a self regulating reservoir of hy- 
- drogen on a better construction than Gay Lussac’s, and the 
ignition is effected by a small calorimotor. 
I have likewise an improved Eudiometer or gas metre. 
A recurved tube with a capillary opening at the end of 
the crook is furnished at the other with a sliding rod gradu- 
ated to two hundred parts. Being filled with water or mer- 
eury, the drawing out of the rod causes air proportionably 
to pass in, or if the point be previously within a bell glass 
holding gas, this will be drawn in. 
I have five different forms applicable to the various rea- 
gents, used for analysis of gases. . 
he caloriphorus has a contrivance by which the hydro- 
gen and oxygen may be exploded by the ignition of a wire, 
instead of a spark, either in a common Eudiometer © 
Volta, or in that above described. 
* This fact is mentioned by Mr. Morey also, in the present No.—Ed- 
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