ON ARTIFICIAL REFRIGERATION. 935 



able tliat this now metliocl of producing ice for next to nothing, according 

 to M. Tellier, was not exhibited in Paris during the recent Exposition, 

 but as the last invention of one of the most fertile brains devoted to the 

 study of artiticial refrigeration, I have deemed it right to give the 

 drawing and description from Tellier's British i^atent which has re- 

 cently reached me. 



He describes his improvements as follows : — • 



"Firstly. In employing trimethylamine, methylamine, ethylamine, or 

 other analogous volatile products which boil at a very low temperature 

 (about 8° or 10°), and which are soluble in water or other liquid. 



" Secondly. In vaporizing one of these products for the purpose above 

 described either by means of the heat of escape steam from a steam en- 

 gine, or by means of any other suitable source of heat. 



"Thirdly. In so combining and arranging the apparatus employed 

 for this x^nrpose as to use only a limited quantity of the refrigerating 

 hody, and to x)roduce a current of aif, gas, or uncongealable liquid 

 carrying the cold to the place and for the purpose desired. 



"For this purpose I cause the escape steam which is to be condensed, 

 or, in short, the source of heat which I wish to utilize, to pass into a 

 tubular boiler, jireferably containing a solution of trimethylamine in 

 water. The trimethylamine vapours, after having been washed in a con- 

 centrated solution of trimethylamine, are forced to pass through one or 

 more worms, where they are liquefied. The liquid product is collected 

 in a reservoir, from whence it falls in a shower, from top to bottom, into 

 an apparatus or case containing a series of tubes enclosing a gas or 

 an uncongealable liquid mo\ing from the bottom upwards. The trime- 

 thylamine is vaporized in cooling the fluid in the tubes, which is then 

 directed to cool the bodies, the temi^erature of which it is wished to 

 lower. 



"In order to utilize the trimethylamine vapours thus produced I can 

 condense tiiem by means of a comi^ressing pump, but I prefer to eflect 

 this condensation by means of the water which contained these vajiours 

 at the commencement of the operation, and from which the application 

 of the heat separated them. For this purpose the said water is cooled 

 and conveyed to an api^aratus or case into which also the trimethylamine 

 vapours enter. The solution of these vapours in the water will be 

 effected under the action of a current of cold air passing in the tubes 

 which traverse this apparatus or condenser. 



"The first solution being thus reconstituted is discharged at the outlet 

 into the tubular steam boiler, heated by the lost vapom'S or otherwise, 

 after having passed through an apparatus where it is reheated in cooling 

 the d]-ahied solution, which is directed towards the condensing apparatus 

 of the trimethylamine vapours. In this manner any given quantity of 

 this liquid may be used over and over again indefinitely. 



"But to make the invention better understood, I will proceed to de^ 



