726 
ON A NEW GAS STOVE. 
36. Peeoxyde de Fee Hydeate*'. 
Hydras Ferricus. Ferric Hydrate. 
Fe2 03 -t-aq. 
Hydrated Peroxide of Iron. 
Prepared by adding a diluted solution of the perchloride of iron to ammonia, 
and washing the precipitate, which is to be preserved covered, with distilled 
water, and in a place the temperature of which should not be below -+-12°. 
The effect of the hydrated peroxide of iron as an antidote for arsenic is more 
certain when the hydrate is freshly prepared. 
(To he continued.) 
ON A NEW GAS STOVE. 
BY HENEY DEANE, F.L.S. 
Having for many years been much inconvenienced for want of a suitable gas 
stove to meet the ordinary requirements of my business, I w’as induced some 
few years back to turn my attention to the subject, and the ultimate result is 
the stove now before the meeting. The contrivances that I have seen have all 
had the great inconvenience of having no other means of regulating the appli¬ 
cation of heat but by raising and depressing the flame, a range far too limited 
to be generally useful. 
I was led to contrive the present form after seeing how a small quantity of 
ignited charcoal was made to do a great deal of work in a French kitchen, the 
heat being applied not only to the bottoms of their vessels, but made to do duty 
on the sides also. In the ordinary mode of applying gas to the boiling of water, 
the action of the flame is confined almost entirely to the bottom of the con¬ 
taining vessel; but in this stove, as in the French cooking apparatus, arrange¬ 
ment is made whereby all parts of the vessel may be subjected to the heating 
influence, which, moreover, is under such control, that almost any kind of 
cooking can be carried on with great facility. Thus, decoctions from half a pint 
to one or two gallons can be made and kept boiling or simmering, or merely 
macerating at a temperature considerably below the boiling-point of water. 
I do not suppose it is the cheapest or most perfect in construction that could 
be devised, but I have found it useful and economical, and well adapted to meet 
the exigencies of many pharmaceutical establishments not conducted on a large 
scale. The great advantage appearing to be, that without occupying much 
space a good fire can be ignited or extinguished at a moment’s notice, and with 
a moderate consumption of gas. The largest quantity it is capable of consuming 
per hour being from twenty to twenty-five cubic feet, costing from one penny 
to three-halfpence; in many cases the cost would not exceed a farthing per 
hour; but of course the rate of consumption will greatly depend on the care 
and intelligence exercised by the operator. 
The stove consists of a stoneware cylinder, ten inches in diameter and seven 
inches deep, covered with an iron jacket, and supported on three legs, contrived 
by means of screws to give a range of elevation or depression of about two 
inches. In the sides are two sets of holes for pegs, on which a support for the 
vessel in use can be adjusted to the required height above the flame. Another 
support is also made of somewhat wider dimensions, to rest, when required, on 
the top of the stoneware cylinder. On the top of this may rest a hood, which 
has been found convenient for confining the flame to certain vessels when a 
greater heat is required, as in the case of subliming perchloride of iron. 
