1806.) 
metal, or other hard {ubftance, as may be 
found moft economical, and belt adapted 
to the purpofe to which the machire is 
applied. ‘The fhaft, f{pindle, or axle, on 
which the inclined plane or wedge is fixed, 
and the bolt muft be fo placed, that when 
a rotary or an alternate advancing or vi- 
bratory motion is given to the fhafi, {pin- 
dle, or axle, the inclined plane, &c. wil! 
aét upon the bolt and force it along, de- 
prefs, or elevate it in its cafe, box, or 
groove; and in general they are fo placed, 
tha: the bafe of the inclined plane, or 
that part which is.in contact with the 
fhaft, fhali be at a right angle, or neariy 
fo, with the bolt. The fhatt, and the 
cafe, box and groove, in which the bolt 
works, fhould be firmly fixed, fo that their 
polition with refpeét to eack o:her cannot 
vary; then a rotary or vibrating motion 
is given to the fhaft, which brings the in- 
clined plane into action; and as the mo- 
tion is continued, the inclined plane, by 
preffing againft the bolt, or the roller 
placed upon it, forces the bolt along irs 
cafe, box or groove. To farce the bolt 
back, a {prin or {prings are made ufe of, 
‘or it may be forced back by a lever and 
weight, or by any other means. The 
bolt and fhaft may be placed in a perpen- 
dicular or inclined pofition, as may be 
found beft adapted to the purpofe to which. 
the machine 1s applied. Mr. Hancock 
ufes one or both ends, or. any other part, 
of fuch thafts, fpindles, or axles, and af- 
fixes one or more inclined planes to. it, 
and he thus applies his machines to the 
purpofes of cutting, prefling, and ftamp- 
ing,,of metals, horn, tortoile-fhell, Jea- 
ther, paper, and other fubftances. 
MR. WILLIAM DEVERELL’S (BLACK- 
WaLL), for Improvements on ihe 
Steam. Engine. 
There are three things claimed by the 
patentee as inventi. ns decribed in his fpe- 
cification, Firft, The manner and form 
of conftrvéting the fire-place, or in uling 
iron for the boiler to ftand on iuftead of 
brick-work ur other compofition. Se- 
condly, ihe metood of ufing the fteam; 
and, Thirdly, An improvement on the 
cold liquor pump. The principal of thefe 
is that of connecting the fteam-boiler with 
three iron cylinders, filled with water, in- 
ftead of connefting it with brick-work. 
Inftead of being three detached cylinders, 
they may be caft whole, or made of 
wrought iron, to form the: fire-plaze, but 
which will be attended with more trouble: 
thefe cylinders may be ufed to great ad- 
Vantage where large boilers are already 
MONTHLY Mas. No. 139. 
New Patents lately Enrolled, 
49 
fet; and being applied to engines of va-. 
rious powers, will with the fame fuel be 
capable of doing more work with the 
fteam arifing from them. In de(cribing 
the peculiar advantages refulting from this 
part of the invention, Mr. Deverell (ays, 
‘© In the prefenet mde of fetting boilers, 
the brick work underneath them is at- 
tended with frequent repairs, owing to 
the action of the fire upen them ; nor is 
this expence the only inconvenience: the 
whole corcern is, for the time that they 
are repaying, compleiely ticpped.”” The 
other improvements, depending on figures, 
and on calculations, cannot be effectually 
delcribed in this work, 
— , é 
MR. ARTHUR WOOLF’S (SPA-FIELDS), 
for certain Improvements in Sieam- 
Engines. 
So mmportant ts the fteam-engine to the 
arts of life, and to tho!e operations in me- 
chanics that require very great powers, 
that we feldom pals many wecks w:thout 
reading f{pecifications of patents for im- 
provements in its ftru€ture or in its mode 
of working. Mr. Woolf’s invention is a 
contrivance by which the temperature of 
the fteam-veflel, or working cylinder of a 
fteam-engine, may be raifed to any re- 
quired temperature without admitting 
fteam from the boiler into any furround- 
ing receptacle; that is to fay, infead of 
admiting fteam of a high temperature 
into fuch receptacle or fteam-cafe, which 
is always attended with a rifque of explo- 
fion, proportioned to the e!alticity of the 
fleam employed, Mr. Woolf puts into 
the faid receptac:e oil or the fat of ani- 
mals, or wax, or other fubftances capable 
of being melted by a lower temperature 
than the heat intended to be employed, 
and of beating that heat without being 
converted into vapour; or he puts: into _ 
the faid receptacle mercury, or mixtures 
of metals, as of tin, bifmuth, ‘and lead, 
capable of being kept in a fate of fusion 
in a lower temperature than that intended 
to be employed in working the feain- 
engine.. The form of the receptacle is 
mace to admit the oi], or other tubftance 
employed to come in contact, not onl 
with the fides of the {team- vefl-I or veflels, 
or working cylinder, but alfo with the 
bottom, and top of the fame, fo that the 
whole ntsy be, as much as pofiible, main- 
tained at one uniform temperature, and 
this temperature is to be kept up by a fire 
under or round the receptacle. By this ar- 
rangement, the necelhty of employing 
fleam of a great expaniive force round 
the feam-vellcl is obviated, and {team of 
GS a come. 
