Peckston’s Theory and Practice of Gus-lighting. 457 
found inadequate for accomplishing the purpose of purification.” 
In the hands of other people, however, this vessel apnears to have 
performed its office very satisfactorily ; for we learn from Mr. 
Accum’s work that it has been adopted at the Gas-Works at the 
Royal Mint, Chester, Birmingham, Bristol, and ** many other 
provincial gas establishments.’ 
In treating again from p. 220 to 272 of the gas-holder, and 
giving “ descriptions of such as would best answer the purpose 
of the manufacturer,” he states pretty positively that a certain 
cylindrical gas-holder, which he describes minutely, with the ap- 
__pendages of balance weights, pulleys, and frame-work, * is the 
most simple construction of gas-holders for working on the or- 
dinary, principles that has hitherto been adopted. ”? “With balance 
weights, pulleys and frames— the most simple construction |” 
Would not Mr. P. think a machine without any of these ap- 
pendages a vast deal more simple? The reader who may think 
with us that there can be no doubt on the subject, will please to 
be informed that all these appendages have actually been got rid 
of, and that gas-holders are now every where to. be found in full 
action, without. any such specific § gravity a apparatus ‘attached to 
them. All that Mr, P. informs us is, that some experiments have 
been made by a Mr, Malam to attain a “‘ method of working the 
gas-holder without using chains or balance weights, and in such 
a way as to have the pressure uniform at all its heights ; 3; and it 
does seem a little Strange that a set of experiments done ina cor- 
ner, and never adopted i in large practice, should have so parti- 
cularlyattracted Mr.P.’s notice, while he has overlooked entirely 
how perfectly all the objects of these experiments have been al-, 
ready publicly effected. by the gas-holders without specific gra- 
vity apparatus adopted at the (as Works of Bristol, Birmingham, 
Chester, and most of the recent establishments for lighting by 
goal-gas, The gas-holder of this description at Bristol is, we 
believe, the lar gest which has been yet erected in this country. 
For its dincunond see Mr. Accum’s work, p. 177. So much has 
the removal of the old appendages, as exemplified 1 in Mr, Peck- 
ston’s ‘‘ most simple construction of gas-holders,’’ contributed to 
lessen the expense of this part of the apparatus, that, as we learn 
from Mr, Accuin’s book, * a reservoir for storing up any quan- 
tity of gas may now be furnished for nearly one- half the sum 
which such a vessel cost as or iginally constructed,” 
The manner in which this important improvement has been 
effected is by attaching to the gas-holder what is called a regu- 
lator or governor, through which the gas is made to pass before 
it enters into the mains. Mr, P, has not been unaware of the 
existence of this instrument, for he has devoted a chapter exclu- 
sively to it; but singularly enough he omits including among the 
“ various 
