ON ARTIFICIAL REFRIGERATION. 935 



able that tliis now luctbod of producing ice for next to nothing, according 

 to M. TcUier, was not cxhilHted in Paris during the recent Exposition, 

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

 study of artiiicial refrigeration, I have deemed it right to give tlie 

 drawing and description from Tellier's British patent which has re- 

 cently reached nu'. 



He describes his improvements as follows : — , 



"Firstly. In employing trimethylamine, methylamiue, ethylamiue, or 

 other analogous volatile products which Ijoil at a very low temperature 

 (about 8° or 10°), and Avhich are soluble iu Avater 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. 



"Thu-dly. In so combining and arranging the apparatus employed 

 for this purpose as to use only a limited quantity of the refrigerating 

 body, and to produce a current of air, gas, or uncongealal>le liquid 

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



"For this i">uri)ose 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, preferably 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, Avhere they are liquefied. The liquid product is collected 

 iu 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 moving 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 temperature of which it is ANished to 

 lower. 



j'ln order to utilize the trimethylamine vapours thus produced I can 

 condense them by means of a compressing pump, but I prefer to eifect 

 this condensation by means of the water which contained these vapours 

 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 apparatus 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 vapours or otherwise^ 

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

 the drained solution, which is directed towards the condensing apparatus 

 of the trimethylamine vapours. In this manner any given quantitj^ of 

 this liquid may be used over and over again indefinitely. 



"But to make the invention better understood, I mil proceed to de- 



