332 Mr. Perkins’ Method of applying his New Invention 
me that it answered the end extremely well. This testi- 
mony in its favour is not among the least of those conside-' 
rations that have induced me’ to make it more generally 
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, hinged to the lower orifice of the funnel, s the 
ing 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 New M’thod of Generating Steam to the Boilers of 
ordinary Steam-Engines. (Edinb. Philos. Journ. No. 
XVIII) 
Havine in our last Number given a very full, and we 
trust perspicuous account of Mr. Perkins’ new Steam-Ea- 
ne, we shall now proceed to lay before the reader Mr. 
erkins’ own account of his method of applying the new 
principle to steam-engines of the old construction. This 
account is taken from the specification of his ‘patent, which 
is Now <e to the inspection of the public. 
In order, however, thata 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 desc iption of itin our last Number. 
“ Plate IX. Fig. 1.* 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 may be a guide to the 
comparative dimensions of the other parts of the apparatus 
This vessel is to be filled with water, and heated by? — 
furnace circumscribing it. On the top of the generator 
ere is an escape valve 6, pressed down by the weightet 
lever c, the pressure being adjustable by the shifting of the 
weight. The valve opens to the steam-pipe d, which is t© 
be supposed as proceeding to the working piston of the en- 
gine. The lateral pipe e, extending from the generator, '§ 
* See Plate IV. Am. Jonrn. 
