474 
Coal Gas • 
section, fig. 4, which have a glass upon each. Z Z Z Z, figs, 
3, 4, 5, and 6, show the tube through which the lamp is supplied 
with gas from the pipe R, fig. 1. 
Another apparatus for coal gas. ParlPs Chemistry. Plate . 
The retort is filled and the cork taken out at D, which should 
be four inches diameter stopt with an iron plug. The tar and 
liquid partly runs down the tube with a stop-cock, next the fur- 
nace, but some of it mounts with the gas, and being cooled in 
the bent part of the tube runs down at the second tube with the 
stop-cock into the barrel B, which is inserted in an outermost 
barrel, and surrounded with water to condense the contents. The 
gas-holder C is suspended with its balance weight from the cieling. 
The rest is obvious. The gas holder and its containing vessel 
may be tin, copper, sheet iron, or simply casks. The perpen- 
dicular tube that rises into the chimney is designed to carry off 
the carbonic gas and water which rise at the beginning of the 
process, and which if mixed with the carburetted hydrogen 
would hurt the combustible quality of the gas sought for. Quere 
if a stop cock at D would not be useful for the first five or ten 
minutes ? The tubes may be lead, tin, or copper. 
The distilled products will pay a great part of the expense. 
ON MINERAL WATERS, 
And watering places : particularly the Carlisle and York Springs 
in Pennsylvania, with a method of making artificial mineral wa- 
ter-— >By the Editor. 
The resort to these situations, is partly on account of ill 
health, and partly for the sake of amusement, company, and variety. 
In England, on the continent of Europe, and in this country, the va- 
rious motives of frequenting mineral springs are the same ; and 
fashion is given to them, and medicinal virtues ascribed to them, ra- 
ther by the votaries of pleasure, than the valetudinarian visitors. 
I do not pretend to deny, that laxative and tonic salts in small do- 
ses are frequently beneficial ; but far more of the cures such wa- 
ters are said to perform, are owing to good society, good scenery, 
amusement, novelty, change of air, incitements to pleasurable ex- 
ercise without fatigue, and though last not least, to faith in the effi- 
