93G EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



scribe tlie same by reference to the accompanying Drawings, in which 

 Figure 1 shews one of the arrangements which may be employed. 



" A is a steam engine of any suitable construction. The escape steam 

 which it produces is conducted into a condenser, shewn at B, and the 

 form of which may A^ary; and instead of being filled with water this con- 

 denser contains a solution of trimethylamine, obtained as hereinafter 

 described. 



"Under the effect of the heat which the condensed water steam gives 

 off, the solution of tvimethylamine is decom^josed, and the trimethyla- 

 mine itself being vaporized, escaj)es by the conduit pipe h b. 



"As gases which separate from their solutions always carry away some 

 water steam, and as it is necessary in this case to have the trimethyla- 

 mine as pure as possible, the A^apours which escape from the condenser 

 B are rectified in the rectifier C, which contains the richest solution of 

 trimethylamine. For this i^urpose the tube h h, is inflected in such a 

 manner that, being doubled round on itself, it may be spread over the 

 whole of the lower part of the rectifier C at z, z. Under these conditions 

 the trimethylamine vapour bubbles in the strong solution contained in 

 the rectifier C, and the vapours which escax)e therefroiA through the 

 tube c, 0, will be found to be cufficiently pure. 



"It should be remarked that it is requisite that this operation should 

 be as complete as possible, and it ma j" therefore be necessary to add one 

 or more rectifiers, or to replace them by a rectifying column similar to 

 those employed in the rectification of alcohol. 



"To conclude with this part of the apparatus, the trimethylamine 

 solution constantly arrives by tlie tube o, h^ travels over the whole of 

 the rectifier, escapes by the tube rt, c, «, c, to run over the whole length 

 of the condenser B, and finally escapes by the tube a dj which conducts 

 it into the float space I), Avhich allows of its expulsion. 



"It will be readily seen that under these conditions a water level is no 

 longer required, and that, just the spaces being filled with solution, the 

 quantity of saturated methyhlaniine whicli arrives by the tube expels (in 

 consequence of the general falling back of the solution communicatLng 

 itself to the condenser B) an equal part of spent solution through d h. 



"The trimethylamine A'apour which escapes by the tube c, c, enters a 

 condenser E, consisting of a worm or coil e, it*, round which circulates a 

 current of water entering at e, a, and egressing at e, &. 



"From the effect of the light pressure which is produced by the ebul- 

 lition of the trimethylamine solution, a relative amount of cold is i)ro- 

 duced by the current of water, hereinbefore described, around the worm 

 or cod e, x^ e, w, and the trimethylamine is condensed; thus condensed, 

 it escapes by the tube e c, which causes it to pass through a worm or 

 coil /, /, /, placed in a receiver F, the object of which is hereinafter 

 described. Finally, it is conducted by the tube /, a, to a float receiver 

 G, which, when it contains sufiBcient hquid, allows the solution to escape 



