~ t 
» $50 
thote, pieces of cork-wood, or flips of 
deal may be introduced, by which a lefs 
P gene! of pitch will be neceflary, and 
efpecific gravity diminifhed. 
Objervations.—The duration -of fhips 
ef war is computed, en an average, at 
2 or 13 years. Mr. Bofquet imagines 
that if his method were adopted, a thip 
would be much better af the end of 20 
years, than by the common conftruétion 
at is after twelve years, fervice. At pre- 
fent great pains are taken to _prederve the 
exterior of veflels, which at all times is 
eafily repaired, while the interior is neg- 
lected. By the patent method, the inner 
pares of the fhip would be the moft dura- 
le; and if a plank fhould fiart, the water 
could not find its-way into-the ship; the. 
pumps would become in a manner ulelefs; 
the averfion that rats have to the compofi- 
tion, would fecure the veel from the de- 
fiructive effets of thofe animals, and from 
the fetid fmell occafioned by their living, 
dying, and rotting, between the timbers. 
The patent compofition will have the 
fame effect as fo much ballaft, in the beft 
pofition in which ballaft could be placed, 
as it will occupy the centre of motion; 
and being f{pecifically lighter than water, 
3t will tend to preierve the fhip in cafe of 
danger from a heavy fea. : 
Such are the principal advantages which 
the Patentee anticipates as the refult of 
his invention.—He obferves,. that fhips 
already built, may be fortified by his pa- 
tent method, at an expence not exceeding 
4or Sool. fora fir& rate Indiaman. 
— 
MR. WALKER’s for making and ma- 
nufadiuring CAPs and Hats, and | 
readering them ~ perfecily WATER- 
PROOF; asalfo all kinds of LEATHER, 
SILKS, LINEN, STUFFS, PASTEBOARD, 
Se. for the purpoje of being avorked 
into BOOTS, SHOES, HATS,.BONNETS, 
and other WEARING APPAREL, iz 
which a POWER of repelling MOISTURE 
is required. 
THe principal obje& of the Patentee 
33 the manulacturing of military caps ; 
for which purpofe, he makes ufe of paite- 
board, to which is cemented with glue or 
paite, linen-clothor any other woven fub- 
ftance. The cap is then cut to the proper 
fhape, and all the feams or joinings are 
.united by narrow flips of linen, &c. and 
then cemented with glie. It is then to be 
painted infide and out with any kind of 
cil-paint; though a mixture of oil and 
lamp-black is to be preferred; and when 
dy, the capis to be varnifhed er japanned. 
The iame procefs is to be applied to lea- 
New Patents lately Enrolled. 
\ 4 ) 
fApril 15 
ther, filk, cotton, &c. before they are made ~ 
into boots, caps, and bonnets- 
Obfervetion.—The objeCtion againit 
water-proof articles of drefs, is, that, 
after a vtry few times wear, thofe parts 
which are creafed by means of the motions 
of the joints, readily admit the rain, and 
thereby fubjeét the wearer to the inconve- 
nience of a partial chill, which may be’ 
equally or more dangerous to health 
than if the moifture were moré generally ap- 
plied. This we admit is not applicable to’ 
the military caps. “But how tar boots, - 
‘fhoes, gaiters, &c. would be comfortable: 
to the wearer after having received two or 
three coatsof paint and as many of japan, 
experience will beft determine. sion 
MR. JACKSON’S for @ DRILL, fo be 
fixed to a PLOW-BEAM, for fewing 
TURNIPS. ; 
. Tuts drill may be made to fow 
turnips, rapeor other fmall rownd feeds, — 
at any given different diftances from each 
other, according to the pleafure of the 
purchafer: it may be adapted to the width 
of any furrow intended to be ploughed ; 
and by a neat contrivance, the feed may 
be dropped either under the furrow or upon 
the furtace of the ground. . 
: ee : 
MR. BROWN’S for a@ METHOD of 
making or preparing EXTRACT of 
ZINC. ' 
THIS invention confifts in faturating 
the vegetable or animal acid with the oxyd_ 
of zinc, found in any ftate, or obtained 
by any procefs. The acid neceflary for 
this operation, may be. made by acetous. 
fermentation, as common vinegar, or any 
acid produced from any vegetable, or any 
vegetable or animal oil ; all or any of which 
being faturated with the oxyd of zine pro- 
duce extract of zinc. 
ane . 
MR. BOAZS TELEGRAPH, Of new 
and improved METHOD of com- 
municaing FHOUGHTS, INFORMA- 
TION, and INTELLIGENCE by means 
of SIGNS, LIGHTS, @ce. : 
Mr. Boaz deferibes his imvention fo . 
confit in reprefenting, at pleafure, by 
means cf lights or luminous. bodies, and - 
alfo by means of opaque bedies, any let- 
ter of the alphabet, or any numerical 
figure, or any appearance as a figh 
or fignal, fuch as plane geometricalfigures 
of all kinds, The following he men- 
tions as one of the fimpleft methods of , 
effecting his purpoltes :—take 25 lamps, 
difpoicd on a board or frame in the a 
. ee 
