332 Mr, Perkins^ Method of applying his Mew Invention 



me that it answered the end extremely well. This testi- 

 mony in its favour is not among the least of those consider 

 rations that have induced me to make it more generallv 

 known. G. C. "^ 



See plate 2, where Fig. 4 represents the rain gage in per- 

 spective. 



Fig. 5 is a vertical section. 



G the body of the gage, F its funnel, L the lid or cover, 

 V the valve, hmged to the lower orifice of the funnel, 5 the 

 spring to close the valve, w a wire to conduct the drain- 

 ings of the funnel into the body of the gage. 



Art. XV. — Account of Mr. Perkins^ method of applying 

 his JVew Method of Generating Steam to the Boilers of 

 ordinary Steam-Engines. (Ed'inb. Philos. Journ. No. 

 XVIII.) 



Having in our last Number given a very full, and we 

 trust perspicuous account of Mr. Perkins' new Steam-En- 

 gine, we shall now proceed to lay before the reader Mr. 

 Perkins' own account of his method of applying the new 

 prmciple to steam-engines of the old construction. This 

 account is taken from the specification of his patent, which 

 is now open to the inspection of the public. 



In order, however, that a correct idea may be formed of 

 the original principle itself, we shall prefix Mr Perkins' 

 own account of the generator, although we have already 

 given a general description of it in our last Number. 



" Plate IX. Fig. I.* represents the general construction 

 of the apparatus; a, a, a, is the generator shewn in section. 

 It is a strong cylindrical vessel, made of metal, about three 

 inches thick in every part, which maybe a guide to the 

 comparative dimensions of the other parts of the apparatus. 

 This vessel is to be filled with water, and heated by a 

 furnace circumscribing it. On the top of the generator 

 there is an escape valve 6, pressed down by the weighted 

 lever c, the pressure being adjustable by the shifting of the 

 weight. The valve opens to the steam-pipe rf, which is to 

 be supposed as proceeding to the working piston of the en- 

 gine. The lateral pipe e, extending from the generator, is 



^ See Plate W. Am. Journ, 



