33 
pitch. Put it again on the fire, and let it 
remain till it fhall again rife in bubbles.at 
the furface. Remove it fromthefire; and 
add of tallow, and either rofin or wax, in 
equal proportions, a quantity equal to 
one-twentieth of the whole bulk of mat- 
ters which you ufe in the compofition of 
the cement. Thefe proportions may be 
varied. After this laft addition is fufh- 
ciently mixed with the other vifcid mat- 
ters; this part of the preparation is now 
fit to be mingled with the fixed parts. 
You next proceed to the immediate 
compofition of the cement. Holding the 
vifcid matter in liquefaction, add to it 
three-fourths in volume of the ferruginous 
preparation fpecified above—one eighth 
of pozzolana, or. what you ufe as a {ubfti- 
tute for it; one-eighth of pumice-ftone or 
its fubftirute; one-eighth of pit-coal; 
and one-eighth of gla(s or flint ftone, all 
duly prepared in the manner above de- 
fcribed. Expofe this mixture of vifcid 
and fixed matters to the heat of a fire fuf- 
ficient to hold them in folution, without 
evaporating the volatile parts. Stir the 
mixture on the fire, to hinder the fixed 
parts from fettling at the bottom. From 
time to time, while you ftir, make trial, 
with the trowel and with your hand, whe- 
ther any portion hardens as it cools, and 
when warm does not ftick to the finger. 
When the mixture has acquired thefe 
qualities, your cement is made ; and you 
may remove it from the fire. It wouid be 
advantazeous to have this laft boiling 
performed by heat conducted to your 
boiler, through the medium of fteam. 
The cement thus made, is removed 
from the fire, left to cool, and then put 
afide for future ufe. In ufing it, you 
break it in fmall pieces; expofe it with 
one-fortieth of either tallow, or any bitu- 
minous fubftance, or vegetable oil, to 
melt for a quarter of an hour in an earth- 
en vefel, or one of caft-iron, over a flow 
fire; and then, without delay, apply it to 
your intended purpofe of cementing. 
: — 
MR. WILKINSON’S PATENT for bis me- 
thod of making LEADEN PIPES. 
Mr. Wilkinfon’s invention for making 
leaden pipes, will, within no long time, 
become free to the common ule of the 
pudlic. It is extremely fimple; and 
therefore, fo much the more valuable. He 
cals the Jead in lengths upon a rod or 
maundrel of iron. ‘Fhe rod or maundrel 
may vary in length or. thicknefs, accord- 
ing to the differences defired in the Jength 
or width of the leaden pipes. The leaden 
pipe upon the maundrel is then extended 
to the exaftlength and thickne/s wanted in 
New Patents lately: Enrolled. 
Feb. f, 
‘the pipes, by drawing the maundrel with 
the pipe upon it, through or between rollers 
with grooves of different fizes. Or the 
maundrel bearing the pipe, may be drawn 
through metal gauges or collars, each 
fucceiiive collar being {maller than that 
ufed immediately before it. Thefe opera- 
tions are eafily done, under the action of 
a common water-wheel. 
SE 
PATENT of MESSRS. KENDREW and 
| PORTHOUSE, for 2 MACHINE for fpin= 
mug YARN, from HEMP, TOW, FLAX, 
or WOOL. 
This invention has, within thefe few 
months, become free to the common ule 
of the public. 
In the machine, wheel-work moved by 
water,a horfe, or any other meais of giv- 
ing the requifite impulfe, communicates 
motion to the exterior of two wheels be- 
longing peculiarly to this invention. 
That, by means of a nut on its axis, 
gives motion to an interior wheel. This 
interior wheel-impels the revolutions of a 
cylinder, by which the whole procefs of 
the {pinning is chiefly performed. 
This cylinder is three feet in diameter, 
and inbreadth, ten inches. It is made of 
dry wood or metal 5 and is covered on its 
circumference with fmoo:th leather. On 
this leather are a certain number of rollers, 
covered alfo with leather, and turning an 
axis of jron. They are of different 
weights. The roller which is the higheft 
on the cylinder, is of two ftone weight: 
the others decreafe to the loweft, which 
weighs only two pounds. A cloth re- 
volves upon two rollers: and by its fide, 
is placed a table precifely of the fame 
length and breadth. To this table belong 
two other fimilar cloths. " 
The workman puts on this table a 
quantity of the material to be fpun, more 
er lefs, as a finer or a coarfer thread is 
wanted.—-He fpreads it equally on the 
{mooth cloths — From thefe he puts of it 
upon the revolving cloth.—Motion is then 
communicated from the wheel-work to the 
rollers and the cylinder. The flax, tow, 
hemp, or wool is drawn forward. It is 
extended in paffing into a thread or fliver, 
From under the action of the rollers, it 
falls intoa cannifter fufpended to receive it. 
The firft fliver may be afterwards re- 
duced on another fimilar machine, with 
only fome neceflary variations, into 4 
thread for cloth of any ordinary finenefg. 
OS =~ la 
MR. CARTWRIGHTS PATENT for bis 
COMBING MACHINE. 
The term for which the exclufive pro- 
perty of this inyention was fecured 
. the 
