1810.] 
MR. GEORGE Pocock’s (BRISTOL), for an 
mmveantion of Geographical Slates for 
the construction of maps. 
The invention consists in drawing and 
conducting the lines of Jatitude and lon. 
gitude, or other material lines or projec- 
tions, according to the kinds of maps 
required, on the substance commonly 
known by the appellation of slates; which 
lines shall serve as guides to learners of 
geovraphy to sketch the relative situati- 
ons of diferent parts and kingdoms of 
the world. Attached to the spscifica- 
tion-is a drawing of the lines that are 
proper to be drawn and jndented on a 
slate, for the scholar to preyare a map of 
the eastern and. western hemispheres. 
Slates for forming maps of the several 
quarters of the world, or any parts of it, 
are to be prepared with appropriate lines 
according to the nature of, the map re- 
quired. The method of drawing these 
lines, says the patentee, ‘‘ is. to take a 
thin plate of metal, or other suitable sub- 
stance, upon which I mark the longita-_. 
dinal lines of the globe, and cut out the 
space desired between the two middie 
ones, leaving the spacé on eacii side 
solid. I then cut out spaces between 
the next two on each side, and. so pro- 
ceed, leaving an alternate space. solid 
and open ull I have finished one hemis- 
phere. This plate will then serve asa 
ruler or guide, by which the longitudinal 
lines may be drawn and indented on the 
slate by asharp-pomted. tool, or other 
proper instrument.” The lines of lati- 
tude may be made in the same way by 
another plate cut out in a similar mais 
ner. 
ee 
MR. JOHN DUMBELL’s (WARRINGTONS) 
for new Methods of Ilax Spinning, &c. 
Instead of preserving tie vegetable 
fibres, or staple thereof, as long as pos- 
sible, and spinning the same in-the usual 
methed, Mr. Dumbell cuts them into 
such leneths as shall render them fit to 
be manufactured by the machinery now 
used for spinving cotton. The common 
agriculiural instrument called the chaff- 
eutter, he finds very well adapred to his 
purpose, but with some variations in the 
structure. Thus he finds it necessary to 
support the flax by a thin stratum of 
 gtfaw, or rushes, or reeds: or he makes 
the delivering parts of the containing 
box, not of an angular, but circular or 
curved form: or he so constructs the 
machine, that the cutting-stroke shail be 
Maile upwards and not downwards, as is 
usually the case; or he makes the cutter 
of extraordinary strength and thickness, 
in order that the edge thereof may nut 
+, Montuny Mac. No. i97. 
~ 
Patents lately Enrolied, 273 
: 
spring or give way, and he causes the 
same to act by moving in close and very 
fair contact with a face of iron or steel, 
or other At matenal, and he protrudes 
the flax to be cut through’ one or more 
apertures in the said faces and in ‘order 
more effectually to open, divide, and 
Separate, the said veestable fibres or - 
staple, and to render the same finer, 
more soft, and flexible, than can with 
facility be effected in the usual methods 
of working the long uncut fibres, or 
staple, he works them by pounding,» 
beating, bruising, stamping, or rolling s 
and also by steep:ng, macerating, digest- 
ing, boiling, spreading, opening, CX POe 
sing, or bleaching. .The flax being so 
prepared, it is treated in the same way 
as cotton is usually treated in the manu- 
facture thereof, and the flax is spun! ta 
the cvutton-spinning engines.  Vhese 
methods are appiled to flax, silk, wool, 
cotton, hemp, tow, and such other bodies 
as atford a fibre or staple fit to be spun 
and manufactured into price goods; and 
according to the nature of the produce 
intended for the market, the materials 
are mized, united, or combined, and 
worked together in various proportions; 
and the operation of spinning flax, as thus 
described, is much facilitated by an ad- 
mixture of cotton, or of silk, or of wool; 
and the fibres of flax are rendered fitter 
for spinning, by subjecting the carded 
material to strong pressure, with or with- 
out the application of heat at the same. 
time, by means of presses, eyhiaders, or 
other .lastruments. . Mr. Dumbeil  re- 
favricates the said produce, and re-pro- 
duces anew body, or material, from any 
other article composed of fibres, and 
warn, cut, or divided into tatters, of 
fragments; and in such re-labrication, he 
euls the produce into portions of shreds, 
or, if need be, inte short pieces, and ree 
duces the same to a loose staple ft for 
spinning, aYone er more Jf the mecha- 
sical Mperations described in his Specie 
fication, ov by such well-known methods 
of mechanical treatment, as may be bet 
suited to the materials. ‘ 
Ne 
MR. JOMN JONES’S (BIRMINGHAM), for” 
improvements in the manufacturing of 
Skelps for Vire-arms. 
dtie principle of this invention consi-ts 
in the maoufacturing iron skelos, Ly 
rolling or otherwise making plates of iran 
1 a taper form, sutficiently large to be 
divided into several of them, and so tha’, 
when cut into skelps, the grain or files 
of the iron may be drawn transversely iu 
every skelp, instead of longitudinally, as 
by the forge hammer, which is the pre- 
a M set 
