‘to the twist of the strand; 
108. ] 
Tn an experiment made by the inven- 
tors, a boat loaded with 9 quintals, and 
presenting to the water a prow of. 36 
square decimetres, 6 feet square, ascended 
the Saone with a velocity double that 
of the current. 
In another experiment made by the 
commissioners, the pressure exerted on 
a piston of 22 centimetres, 3 square 
inches, held in equilibrium a weight of 
57 kilogrammes; the intemal capacity 
was 4138 centimetres, 24 inches, and 
the consumption of fuel was only 32 
centigrammes; 6 gr ains. 
The inventors propose to bring this 
machine to-still greater perfection; but 
even in its present state, the violent 
successions of the Pase bane. the motion 
which it communicates to the body on 
which it rests, in short, the rapidity of 
the movements, affords a suthcient proof 
of the intensity and impetuosity of this 
new moying power; and from which: 
the most advantageous consequences may 
be expected, when repeated experiments 
shall have brought it to that degree of 
perfection of which it is susceptible. 
Such is the opinion of the commis- 
sioners, and the class, we are informed 
by M. Delambre, has ordered the report 
to be inserted without any abridgeinent 
New Patents lately enrolled. > Bs 
in the historical part of their memoirs, 
in order to preserve the recollection, 
and the date of an invention, which bids 
fair to produce such important conse- 
quences, both in a physical and econe- 
mical point of view, 
M. Pictet, a corresponding member 
of the Institute, has presented on the 
part of Messrs. Malley of Geneva, ten 
models of scapements, constructed of 
the same calibre, and of which the threg 
last are the invention of M. Tavan, the 
artist who executed all the models. 
It is impossible, says M. Delambre, 
in the compass of a report, to convey @ 
periect idea of the various parts of the 
mechanism, or of the copious report, 
in which M. Prony has analysed and 
described these scapements. We can 
only state, according to the opinion of 
the commissioners, which was adopted 
by the class, that they display a spirit 
of Invention, with an accuracy of execu- 
tion, which evinces very distinguished 
talents; and the commissioners farther 
express how much it is to be wished, 
that the society of Geneva would publish 
the descriptive memoir, which accom- 
panied the medels, 
- ( Lo be Continued ) 
NEW PATENTS LATELY ENROLLED. 
ce 2 
MR. WILLIAM CHAPMAN'S, and MR, ED- 
WARD WALTON CHAPMAN’S (NEWCAS- 
TLE ON TYNE,) for a Method of 
making a Belt or Flat Band for the 
purpose of drawing Coals, §c. up the 
Shafts of Mines, sc. 
HE nature of this invention con- 
sists, first, in the combination of 
two or any greater number of strands 
of shroud-laid-rope, laid side by side, 
so as to form any determinate breadth 
of belt or flat band; and, secondly, in 
the peculiar machinery for facilitating 
its formation, A strand of a shroud-laid 
rope, is the first combination of the yarns*. e 
which are twisted together round one 
common axis, so as to form a compact 
cylindric mass; and the common shroud- 
laid rope is formed of three of these 
strands twisted together the contrary way 
which for 
common purposes is necessary, although 
the loss of strength is so considerable, 
that exclusive of the reduction of length 
from being made into a rope, the strength 
of two strands made in such a way as to 
quake all the yarns bear an equal tension, 
¢ 
be twisted contrary ways. 
or nearly so, will, w hey laid side by side, 
be nearly equal to that of three such 
strands combimed in a rope; from which 
circumstance the chief advantage arises 
in forming the strands into belts, instead 
of making them into ropes. The belts _ 
will be best composed of an equal number ~ 
of strands, each alternate one twisted 
the contrary way to the other, so as to 
counteract the tendency they would 
otherwise Have to twist round one ano- 
ther. It is also eligible that the yarns 
for the differently twisted strand should 
Four, six, or 
eight strands will form the most conve- 
nient belt, but each extreme verges 
towards its respective disadvantage: viz. 
if liable to be chated, the broad belt will 
be soonest injured ; but, on the other 
hand, the narrow belts, from the neces- 
sarily increased thickness of the strands, 
will sooner destroy themselves by bending 
over the pulleys. In forming the flas 
belts, attention should be paid to i 
strands being all brought to an equal 
tension before they are * combine d toge- 
ther, Which combination may be done 
In 
