4838 Mr. Wood's, Mr. Tennant’s, and Mr. Simpfon’s New Patents [July 
the fulcrum ; and the weight to be raifed 
is affixed to the extremity, and at the other 
fide of the fulcrum. 
For example, fuppofe the line AB 
fo .reprefent a lever; C, the fulcrum ; 
B, the weight of one pound; and D, 
the weight or power or preffure of fix 
pounds ; then, it is obvious, if the length 
ef the lever be divided into twelve parts, 
and the diftance CD be one of thofe 
parts, that the weight at B will be ex- 
actly balanced or fufpended by the pref- 
fure or power at D. : 
A D B 
Cc 
Mr: Kent applies this principle to ro- 
tatory motion, by confidering the ful- 
crum C, as the vertical axis or line of 
gravitation in a wheel; B, as the ex- 
tremity of the horizontal diameter, to 
which is afixed a rope appending a 
weight; and D a point in the periphery 
efthe wheel upon which point a power is 
made to prefs 6 times as heavy as that 
of the weight at B. 
The mode he propofes by which to ap- 
ply the preffure of Dupon the wheel, 
is by means of a circular axle, on the ex- 
tremities of which axle he affixes the necef- 
fary power or preffure; the axle is turned 
by means of flies, vanes, or winches, and 
being ftrongly frefed againft the peri- 
phery of the wheel, it forces the wheel 
round in an oppoiite direction to that of 
the axle, and thereby raifes the fufpended 
weight. 
Mr. KENT is very fanguine in refpe& to 
the practical effect of this oblique preffure 
onthe peripheries of wheels. He con- 
ceives that a perpetual motion may be 
effetted by it, and that wheel carriages, 
fhips, &c. may be moved forward by its 
varied application. 

MR. WOOD'S FOR A TIME-SETTER. 
ON the twentieth Day of April laft, 
Mr. Henry Woop Statuary, of 
Sloane-Square, in the Parifh of St. Luke, 
Chelfea, obtained a patent for the in- 
vention of 2 time-fetter. 
In the conftru€tion of this time-fet- 
ter, he takes a common #al-plate, fuch 
as is ufed for watches or clocks. It may 
be round, fquare, oval, or of any other 
fimilar fgure. He infcribes upon it the 
hours and minutes which mark the ufual 
divifions of the day. Next, confidering 
what particular round of daily employ- 
ments it is wifhed te indicate, he infcribes 
alfo, the names of thefe upon the dial- 
plate; the name of each employment, at 
the numerals af the hour and minute at 
which it is to be performed. Hands or 
fliders are then to be adapted to the dial- 
plate thus marked. The plate, with 
thefe hands, are to be fitted, after this 
preparation, to the ufual machinery of a 
watch orclock. The movement of the 
hands will indicate the time for the different 
employments f{pecified on the dial-plate, 
as it points, fucceflively, to the hours 
which were marked for their performance.’ 
The hours for prayers, for dinner, for 
retirement to reft, or from any other fimi- 
lar office of life, may in this manner be 
indicated by the revolution of the hands in 
Mr. Woop’s invention. The machine 
may be fitted te tables, walls, doors, or 
any other piece of furniture. Not only the 
diurnal tafks of life, but thofe, alfo, which 
recur after much longer intervals, may 
be, in this manner, fuggefted to recollec- 
tion. It is eafy to perceive, that this con- 
trivance, though, in truth, extremely fim. - 
ple, may be happily applied to many im- 
portant and elegant ules. 
MR. TENNANT’S, FOR A BLEACHING 
LIQUOR. 
On the 30th of April, a Patent was 
granted to Mr. CHaRLES TENNANT, 
bleacher, of Darnley, near Glafgow, for 
anew and improved mode of bleaching 
and removing colours from linen, cotton, 
and other vegetable and animal fubftances. 
Mr. Tennant effects this purpofe by 
means of a diffolution in water of the 
exygenated muriates of lime, or of the 
oxygenated niuriates of calcareous 
earth, barytes, #trontites, or magnefia. 
The earths are prepared in the dry 
way, by bringing them in a folid form, in 
powder, or in pafte, into conta& with the 
oxygenated muriatic acid gas ; fo prepared, 
they are diffolved in water, and then applied 
to the fubftances required to be bleached. 
MR. SIMPSON’S, FOR A TOOTH DRAY= 
ING INSTRUMENT. 
Tuts inftrument confifts of claws of 
Various fizes, which adapt themfelves to 
the fhape of the teeth, and ‘by the action 
of a fpring, become firmly fixed to the 
neck of the tooth required to be drawn. 
The other parts of the inftruments are 
a lever of polifhed fieel affixed without the 
mouth in a tranverfe iron handle; and 
within the mouth in the top of the 
claw. Near to the inner extremity of 
the lever, and in it, is affixed a circular 
fulcrum, which by turning the lever raifes 
the claw and the tooth with it. The 
circular fulcrum is made to reft on a 
cufhion which is carefully adapted to the 
ftate of the adjoining teeth. 
The 
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