Method for preserving Flameunder JVater.— Metallic Gauze.307 
of the atmosphere, the fall of the water being regulated by a 
valve and lever. This machine intermits, and the whole is under 
the complete controul of the patient. 
The bulk of the descending spherule of water is proportional 
to the orifices in the base, and the period of duration correspon- 
dent with that of the suspension of the valve. 
It is also obvious, that if the recipient be supplied with water 
at 98° F., and the apertures are sufficiently minute, a heated dew 
will precipitate, and all the effects of the vapour bath be ob- 
tained. 
Of this machine a description and figure have already appeared 
in No. IX. of The Edinburgh Philosophical Journal, and baths 
erected on this principle, But as some little difficulty may be ex- 
perienced in preserving the horizontality of the bath (when sup- 
plied with water by the cistern) in its elevation to the required 
altitude, 1 beg to observe that I have reversed the arrangement. 
The vessel with its valve, remains fixed and stationary in its 
place, and the cistern of supply is raised by the winch to feed 
the bath; and thereafter lowered into its place to act as a plat- 
form for the patient. A shower bath on this last modified con- 
struction has already been erected at Derby, with the most satis- 
factory results. I am, &c. 
Oct. 8, 1821. J. Murray. 
METHOD FOR PRESERVING FLAME UNDER WATER. 
{From the Aets of Leipsic.} 
A Doctor of our University having lately proposed to furnish 
fishermen and divers with a method of preserving flame under’ 
_ water, contrived the fitting of, toa glass vessel, which shut very 
exactly, two pipes of leather ; whereof one continually supplied 
the lower part of the vessel with fresh air, by means of a bellows 
with asucker and single or double wind; and the other, that 
opened into the upper part of the vessel, and was long enough to 
be always above the surface of the water, served to give vent to 
the fuliginous vapours drawn by the current of air from the first 
pipe.— Universal Mag., Nov. 1761, p. 259. 
ON THE USE OF FINE WIRE WORK, OR METALLIC GAUZE, AS A 
SUBSTITUTE FOR HORN, &¢, BY ALEXIS ROCHON, 
[From the Journal de Physique.] 
“The great brittleness of glass was a sufficient obstacle to the 
use of that substance, in the place of horn, on account of the 
danger that would attend the breaking of such a lantern in the 
powder room, or in any other part of the ship where powder or 
other combustible matter might happen to be.”” Page 207. 
Qq2 elt 
