1802.) 
be fully juftified in giving a decided pre- 
ference to Mr. Pott’s invention, compared 
with all former ones of the fame kind. In 
giving this as ovr opinion, we have only 
followed the decided teftimonies given by 
almoft all the principal furgeons in Lon- 
don and Edinburgh. 
The above patent is now the property 
ef Mr. W. Sheldrake, No. 483, in the 
Strand, near Charing Crofs, who takes 
great pleafure in exhibiting to the curious 
and men of {cience the principle of the in- 
Yention. 
— YE 
MR. DICKENSON’S (LONG-ACRE), PA- 
TENT for certain 1MPROVEMENTS i” 
the CONSTRUCTION of, and ADDI- 
TIONS fo, SADDLES, HARNESS, &c, 
Mr. Dickinson aflumes that the prin- 
cipal defeét in the common conftruétion of 
faddles, &c. arifes from the want of elaf- 
ticity of the materials of which they are 
compofed. This induces the neceffity of 
girthing the animal too tight, which ima 
pedes the refpiration, as well as endan- 
gers the girths. With refpeét to the 
crupper, he conceives it almoft impoffible, 
with the common conftruction of faddles 
and harnefs, to obferve that juft medium 
which fhall preferve the faddle in its pro- 
per place, and yet not incommode the ani- 
mal. His own improvements confift in 
the addition of certain elaitic fprings, in- 
terpofed between the parts of thefe articles 
of horfe-furniture. He lodges one or 
more fpiral {prings, fimilat to thofe made 
ufe of in {pring tieel-yards, in certain ca- 
Vities, to which a piece of cat-gut or wire 
is faftened, or made to bear again{t one 
end of it; this, when drawn or acted 
upon, caufes the parts of the fpring to 
approach more nearly together. To the 
end of the catgut are fixed ftraps, or 
other faftenings, for the ready fixing of 
the girth, crupper, &c. in the ufual man- 
ner. 
The fpiral fprings are inclofed in pro- 
per receptacles, which form a feparate 
piece capable of being applied or attached 
between the faddie and the extremity of 
the girth, crupper, &c. fo as to commu- 
nicate to the faid appendages the effect of 
its own elafticity in the longitudinal di, 
section. 
Mr. Dickinfon includes all materials, 
forms, and fhapes in his patent; fteel, 
however, he thinks the beft fubftance, and 
the fpiral the moft commodious form. In 
fome cafes he makes ule of cagutchouc, or 
. €ommon Indian rubber, 
New Patents lately enrolled. 
383 
MR. FRANCIS BREWIN’S (BERMOND- 
SEY), PATENT for az IMPROVED: ME~ 
THOD of TANNING. He) 
Tuis improved. procefs of tanning 
confifts in confolidating floaters and taps, 
that 1s, by drawing the oozes for the vats, 
and handlers from the floaters, and work- 
ing the oozes through the floaters, in every 
refpeét, as though they were a fet of taps, 
and ufing them, at the fame time, in the 
nature of floaters, by handling the greeneft » 
packs in them. Thefe vats Mr. Brewin 
calls floating-taps. ‘Twenty or twenty- 
five vats of nearly the fame fize, in the 
form of a fquare of parallelogram, con- 
_ ftitute one complete tan-yard : of ‘thefe, 
r 
two or three of the center vats are ufed 
as fpenders, four or fix immediately next 
are floating-taps, each containing an eye 
and a falfe bottom. The reft are vats 
and handlers inwhich the frefh bark is ufed. 
One floating-tap is kept empty to contain 
the whole pf the ooze and bark in a vat 
or hand!er, into which floating vat the ooze 
and bark are drawn from vat or handler. 
A pump is ufed to draw off the ooze. 
By difpofing the fpenders, taps, vatts 
&c. in the manner defcribed, barrows or 
long fhoots will feldom if ever be requir- 
ed. And the material advantages derived 
from this procefs are, the leather is made 
of a fuperior quality, being more folid and 
weighty than other leather, and is manu- 
factured in lefs time: the leather, when 
curried, will be much more water-proof 
than common leather, as it will take in 
more oil in the procefs of currying ; the 
leather will be much tougher than other 
leather ; the labour, as well as the quan- 
tity of bark, required in the procefs, is 
lefs in this than in the common method of 
tanning. 
aa 
MR, MATTHEW MURRAY'S (LEEDS), 
PATENT for @ METHOD of conftructing 
the AIR-PUMP, and fundry other PARTS 
belonging toa STEAM-ENGINE, by which 
there will be a SAVANG Of FUEL) and 
an increafed POWER obtained. 
_Mr. Murray’s invention embraces 
fix principal ebjects :—1. By the new air 
pump, the air is difcharged without its 
having to make any effort in opening of 
valves, or preffing through a body of wa-- 
ter, and in caufing the water and air to be 
difcharged feparately, and different ways: 
it is effeed by taking cut the air alone 
by one bucket, and the water alone by 
another, or by an eduction-pipe 28 feet 
long. 2. The fecond principle is an im- 
proved method of packing the cylinder- 
3 D2 hd, 
