402 
the ‘patentee may be ‘thus described :— 
There are two wheels of the same dia- 
meter fixed on a nut and screw, but one 
of the wheels has one tooth more than 
the other, and they are both turned by 
the same pinion. Suppose one to have 
100 teeth and the other 101, then when 
the latter has made one complete revolu- 
tion, the other will have made one revo- 
lution and the one-hundredth part of 
avother, consequently the screw will have 
risen one-hundredth part of the distance 
between two of its threads; and then, 
according to the principle of the screw, 
the increase of the power obtained by 
this method will be in the proportion of 
200 to 1. If there be another screw and 
Rut revolving round a pin in the centre 
of the upper part of the screw, on which 
the other wheels revolve, and suppose 
to the nut there be fixed a wheel having 
402 teeth, and to the screw a wheel 
having 101 teeth, then when they are 
turned round by the’same pinion, as soon 
as the nut has made one revolution, the 
screw wil] have made one revolution and 
the 101ist of another, by which operation 
the nut will be lowered the one hundred 
and first part of the distance between 
two threads of the screw. The turning 
of the two first-mentioned wheels, there- 
fore has the effect of raising the nut the 
shoth part, and the turning of the two 
last-meutioned wheels the effect of low- 
ering the nut the ~Z;st part, of the dis- 
tance between two threads of the screw; 
consequently, when the wheels are turned 
all together once round by the same 
pinion, the effect will be that of raising 
the end 545 X ic = rotor or the ten 
thousand one hendredth part of the dis- 
tance between two threads of the screw, 
and the increase of power obtained by 
this method will be in the proportion of 
10100 to 1. These wheels, &c. are shewn 
by drawings attached to the specification, 
as are likewise two others in a small 
frame, whichis attached to the large one 
by hinges, and which are to be used 
when it is required to produce an in- 
erease of velocity: for this purpose the 
pinion must be raised upon its axis, so 
as to. be disengaged from the wheel, and 
the wheels in the small frame must.be 
brought’ in contact with the pinion and 
wheel, so that the pinion may turn the 
upper wheel in the small frame; and the 
Jower wheel in the small frame turn the 
wheel. ‘The effect will be that of turning 
the wheels in contrary directions: the: 
screw and nut will move in opposition to 
each other, and the end will, by this new 
method, rise with an increased velocity. 
a 
New Patents lately enrolled. 
[June tf, 
Another figure represents two screws, 
with their nuts placed opposite to each 
other: now, if the screws be turned by 
machinery similar to that already de- 
scribed, their nuts. being fixed; then, if 
they be turned in the saine circular direc- 
tion, one screw will advance, and the 
other recede; or, if the screws be fixed, 
and the machinery applied to the nuts, 
then one nut will advance, and the other! 
recede; but as the motion of one will be 
quicker than that of the other, they will 
gradually approach, and there will be an’ 
increase of power procured, 
ee 5 
MR. ANTHONY BERROLLAS'’s (DENMARK= 
STREET,) for a Method of making infal- 
lible Repeating Watches. | 
First. The outside of the watches her. 
referred to resembles that of common 
watches, except the pendent, which is 
mounted on a button consisting of two 
parts ; of these the lower one does not 
move, and the upper one having an end- 
less screw annexed to it, turns round and 
comes out to the extent of four turns, 
and is cut in four turns and a half. The 
upper part of the button being turned to 
the right, screws off from the lower part, - 
and operating upon the hour rack, can be 
continued to be unscrewed, until it has 
struck the hour which the hand indicates, 
when it cannot be further: unscrewed. 
The same part being afterwards screwed 
to the left, to bring it back again, to join 
the lower fixed-part, operates upon the 
quarter rack, and quarters are struck in the 
same manner as the hours, until the one 
part is completely juined to the other. 
Secondly. The movement of this watch 
is the same as that of a common watch 
that is not a repeater. The wheel works 
are of the same height ; which is not. the 
case with common repeaters, in which 
the operation of striking being occasioned 
by a work in the movement composed of 
five wheels, five pinions, and a barrel and 
main spring, recessarily cause the move- 
mentewheels to be smaller, and this in- 
jures the solidity of the work, and auge 
ments the labour. The sort, of escape- 
ment may be made according to fancy. 
The hammer which strikes the hours and 
quarters is the only additional piece which 
is in the frame of the movement, and 
which distinguishes the infallible repeat- 
ing watch from 2 common watch not a 
repeater. ; cit 
Thirdly. The motion is composed of 
three principal! parts: the first contains 
the hour rack, the second the quarter 
rack, the third the pendent and endless 
screw. The latter turning on itself ascends: 
perpendicularly 
