1806. ] 
the conductors muft be furnifhed with a 
ftop-gaté or paddle at each end; and the 
ends of the upper and lower canals mutt 
alfo have ftop-gates.. The two conduét- 
ors mult be fufpended by a competent 
number of ropes or chains, one end of 
each to be made faft to ftrong pieces of 
iron or timber faftened to the fides of the 
conductors, and meeting over the centre, 
and the other ends faftened to two drums 
er wheels upon horizontal fhafts. A 
counter-balance to the weight of the ropes 
is effected by their coiling on the drums, 
and the height of the lift being given, 
the diameter of the drum to produce the 
effect is eafily found. 
The ends of the canals muft be truly 
made, and covered with leather, which is 
to be ftuffed, between the leather and wood, 
to form an ela(tic body ; fo that when the 
ends of the conductors are forced againt 
them, by a fpring or any other contrivance, 
they may be warer-tight. 
from the lower to the upper level, open 
the gate inthe lower conduétor, and the 
corre{ponding one in the lower canal, and 
{wim the boat into the conduétor, which 
will difplace a quantity of water. from the 
conduétor, equal in weight to the weight 
of the veffel and cargo; fo that the con- 
ductor, with its contents, is always of 
the fame. weight. When the veffel is in 
the condustor, and the gates fhut, the ap- 
paratus is to be fet in motion by a pinion 
acting in a wheel fixed on the axis of the 
drum, or by any other mechanical con- 
trivance; and the top cendactor being, 
with the water in it, equal to the weight 
of the lower one, will defeend, and the 
bottom conduétor, with the veffel in it, 
will rife; when it arrives at the upper le- 
vel, the top conductor will have defcend- 
ed to the lower level. Hence one veffel 
may be lowered in one conduétor, while 
another is rifing in the other condu&or, 
fince the equilibrium js not deftroyed by 
the veflel entering the conductor. It may 
be expedient to give the defcending con- 
ducter more weight than- the afcending 
one, to produce motion 1m the apparatus 
with more eafe, which may be effected by 
not fuffcring the defcending conductor to 
go quite fo low as to bring the furface of 
the water in it tothe Jevel of the water in 
the lower canal, {> that when the gates 
are opened a imall quantity of water will 
run out of the conductor into the lower 
canal. The ftrength of this apparatus, 
and number of ropes, will depend upon 
the weight of the veifel. 
Third!y, Another obje&t of this patent 
#s the application of a telegraph or fignal 
New Patents lately Enrolled. 
To pals a boat: 
459 
to the purpofes of canal-navigation, which 
is intended to produce a very confiderable 
faving of water in pafling locks, when 
they are fo far diftant from each other 
that the lock-keepers cannot fee the boats 
from one ‘lock to another; for it.takes no 
more water to pafs a given number of 
boats up the locks, and as many down, 
provided they pats alternately, than -it 
would to pafs them in fucceffion, in either 
direction, by the affiltance of the tele- 
graph. The telegraph or fignal may bea 
ftraight piece of timber, with a board 
framed into the upper end of it about 
eighteen inches long, and one foot broad, 
having around hole cut through it about 
eight inches in diameter, a frame being 
fixed in the ground to receive this piece 
of timber, when raifed perpendicularly, 
and in which frame it will turn round; 
therefore, when the firft lock-keeper has 
a boat in view upon the canal, he turns 
‘the flat fide of the board towards the next 
lock, which: informs tbe next lock-keeper 
that there is a boat coming in that direc- 
tion: the middle lock-keepers are furnifi- 
ed with two telegraphs or fignals to give 
information each waye 
Fourthly, The laf thing mentioned in 
the {pecification now before us, is a me. 
thod of raifing a funken veflel; which is 
done by mooring two loaded veflels along- 
fide that which is funk, with two or more 
pieces of timber, long enough to project 
over each fide of the loaded boats, half 
the breadth of the boat, with a pulley or 
roller fixed at each end of the timbers, for 
one or more ropes or chains to pafs over, 
one end to be faftened to the funken beat, 
and the other to an empty boat on the 
outlide of each of the loaded boats. When 
all the chains are made faft, by unloading 
the loaded boats into the empty ones, the 
funken boat will thereby be railed, 
MR. JONES'S (BIRMINGHAM), 2” the 
Manufacture of Fire-Arms. 
It is well known that the barrels com- 
monly called twifted bariels, are formed 
by winiing a fmall fquare or flatted bar 
of iron f{pirally round a mandri], while 
the faid bar is in ared hot ftate; and thea 
withdrawing the mandril, and heating 
the bar to a welding heat, it is jumped or 
knocked together in the direction of the 
length of the mandril, which caufes the 
fpires or twifts of the bar, or fkelp as it 
is cal'ed, to cohere, and to form the twif- 
ed barrel. Other welding heats are rhen 
given toit, and it is forged upon a man. 
dril to the proper form and thicknefs. 
My. Joves’s meth.d confiits in. for.ning 
ine the 
<a eS + re See 
