154 
ficiently, buoyant to support the whole of 
the lamp (that is, the vessel with, the 
tube, and the burners attached to its su- 
perior extremity) in water, or such other 
fluid as it may be thought proper to use, 
for the purpose of supporting the neces- 
sary coluinn of oil by its hydrostatie 
pressure, when the cylindric vessel is fill- 
ed with either oil, 
additional float fitted on the tube towards 
its superior extremity, which is so adjust- 
ed as to be capable, together with an in- 
ferior float, of supporting the whole of 
the lamp. The floats may be made of 
any buoyant substance, capable of being 
adapted to alike purpose; such, for exam- 
ple, as the lighter kinds of wood var- 
nished, or cork: or they may consist of 
tin-plate, thin brass, or any other thin 
metallic plates, soldered up, sa as to 
form a hollow air-tight. vessel. The ex- 
terior part of the lamp serves to contain 
the fluid, by the hydrostatic pressure of 
which the necessary column of oil for the 
supply of the burners at the superior ex- 
tremity of the tube is to to be supported ; 
and in which the lamp itself, with itstube, 
the burners, and the floats, are intended 
to float when the vessel ‘and tuhe are fill- 
ed, either with the oil originally intro- 
duced -into it, or with such residue of it 
as may from time to time remain uncon- 
sumed; together with such portion ofthe 
water, or other fluid heavier than oil, by 
the hydrostatic pressure of which the co- 
lumn of oil Is intended to be supported. 
It must be observed that whatever be the 
specific gravity of the heavier fluid, the 
relative heights of the whole of the vessel, 
with the tube, must be in a somewhat 
greater proportion than the inverse pro- 
portion of the specific gravities of those 
two fluids, to enable the cotton to pro- 
duce, by its capillary action, a sufliciently 
copious supply of the oil, &c. ‘The pa- 
tentee next gives a method for cenveni- 
ently filling the vessel ; and he adds, that 
the burner consists of a tube tapermg up- 
wards, to the upper part of which, and 
not more than about one-half its diameter 
below its superior extremity, there is at- 
tached a smal] plate or ledge, concave 
‘upwards, and projecting on eyery side 
from the exterior of the tube itself to a 
r 
ve 
distance equal to about one-half of the — 
diameter of such tube. ‘The intention 
and effect of this projecting plate or ledge, 
are, to. catch the small quantity of oi! which 
generally exudes from the wick of alamp. 
that is sufficiently supplied, and by that 
ineans not only vrevent the nnpleasaut 
eifect which results from the flawing of 
Ae 
Patents lately Enroiled., 
There is alsooan 
[M arch 1, 
the oil down the sides of the burner, but 
_ apply the oil, which would otherwise be 
wasted by this means, to the purpose of 
more copiously supplying the combustion 
of the wick. 
that no part of the oil which exudes from 
the wick during its combustion may be 
wasted, and that the disagreeable effects 
which would result from its flowing down 
the sides may he still more effectu- 
ally prevented, Mr.'B. attaches to the 
tube which constitutes the burner, at a 
convenient distance below the plate or 
ledge, a second plate or ledge, of the 
same figure, but of larger dimensions 
than the one already described, The 
tube which constitutes the burner, is per~. 
forated hetweén the two plates with two 
or more horizontal circular rows of small 
apertures, surrounding such tube: by this 
contrivance, any such oil as escapes over 
the edge of the upper of the said plates, 
may be caught by the lower one, and by 
that means again brought into contact 
with the wick through the apertures; 
and also, the external air which ‘is a¢- 
mitted through the apertures, and a cer- 
tain quantity of which will, of course, rise 
through the interstices of the cotton to | 
the lighted portion of the wick, will as- 
sist in promoting combustion. 
MR. WILLIAM HUTTON’S (SHEFFIELD) for 
a Method of makzng Sickles and Reap- 
he Habis. lea peat 
The nature of this invention shall be 
desctibed nearly in the author’s own 
words:—T'ake a piece of steel, hammer 
or roll it into a proper thickness, then cut 
or pare it into the form of a sickle or 
reaping-hook; this may be called the blade 
of the sickle or hook: then tooth the. 
blade, if for a sickle, in the usual man- 
ner; next harden the blade in the hard- 
ening-mixture now used for saws, and 
give a temper or colour according to the 
In order, however, both - 
quality of the steel of which it is made; | 
then set, and grind it. The back may be 
made, and affixed to or upon the blade, 
in the following manner:—the blade being 
made, holes are to be pierced through 
that part intended to be affixed to the 
back; then take a piece of iron or steel, 
and hammer or draw it into the form of 
the back of a sickle or hook, and fit it ta 
the blade ; afterwards, pierce holes in the 
back to correspond with those pierced in 
the blade, and fasten them together 
either with rivets or screws. Or the backs 
may be made and fastened to the blades 
in this way: take a piece of iron or steel, 
roll, forge, ‘cast, or hammer, it to any 
“thickness 
