FUSE E. ‘ 
wheel by a pin behind the wheel, when the clamp M is acted 
muit depen upon the 
we fhall jee more clearly 
Above and below the bcd ie are 
eac by a pin paling along focket P, 
that they have eon. piece ommo e of motion, in the 
manner cel a long joint ; this focket ; is ok to the double 
ever, feen detached at fiz. 6, with five holes near its centre, 
and on a fimilar — at its oppofite end ; the cock, which 
is feen in fig. 7, is fixed by a {crew and fead pin to the 
bottom plate A B, _ ond the {mall frame E F, and fup- 
ports the double lever P Q, by a a pin placed i in fome one of 
its five holes, accordingly as the oppotite ends of the lever 
are to be pro oportioned to each other, that 1s, accordingly: 
as the central pin is inferted into firit, {econd; or third, 
&e. hole of the double lever. R isa lo ong bar, of equal 
breadth throughout, that fupports ae ead ‘tool S$, and 
a is at liberty to fide within the puppets D and D with- 
e; another pair of ftrong wires, like N and O, are 
mad to this bar above and. below, w sears wires have me 
mmon centre of motion rou pin, paffin 
neuen the focket Q, at the aepsnie a fs ie Sable 
ever. 
_ From this arrangement it is evident, that whenever the 
wan towards the winch, by the revolution of 
O will meek their end of the 
ollow ; but as the oppofite end- of the faid 
e ina contrary direction, its wires will draw 
back the long bar R, and with it the cutting tool, the fufe 
in the mean tumc bei is obvious that a’ 
little preffure on the Seedle 8 e the cutting tool will: form 
a fpiral groove, fuch as-was defcribed when we detailed the 
as of the laft engine. The number of turns on the 
furfee may be limited either > altering the central’ pin be- 
tween the oppolite levers, or by changing the wheels for 
others of different pee a refpect to their diameters and 
numbers of teeth, 
required. We are “ailpal ed to a . the variety of 
fittings in this conftruction of different 
powers, are not calculated to ae the: Pen to be p 
asi equally fleady; particularly when the parts of afin 
ie a ee loofened by ufe. 
may not be improper to fubjoin here: another method 
of pai ying ae cutting point to the fufee, which feems 
calculated to baa ent parallax or lateral motion of the point ; 
R, in fg. 8,- 
fixed falt to che tee lever B; this lever 
ence it 
a) 
i“) 
aft on the 
arbor A, which turns on two pivots at the ae a.and a‘ {ere 
then fuppofing D to have a handle like. 
fixed to the bar R; 
S in jig. 4, the motion of the arbor A round its pivots will 
allow the cutting point to approach, or. recede from the 
fufee, according to the quantity of preffure applied to it in 
the act:-of cutting. This-conftruGion is not fo common as 
that in fig. 4, but muft be more ete! > and would probably: 
ait to B,. 
to preferve ies horizontal pefiticn of the une! as it - 
cut. hetter if there were a joint wher is made 
recedes or advances. 
3. Fufee-engine (common) adling by the union of @ one fer ew and 
two fingle levers.—The ufee-engine re oe ented in fig. I. 
of Plate XXKV IIL, of Horology, is the common es 
aken froza one of the Lanca Wie pea bake nd-is the 
molt fimple of any ; is a plate of brafs, on which 
the dove-tailed plate E EF “fide switheut fhake, and: with but 
litthe frigtion » the fides being perfectly parallel. The axis of 
the- a i and al 
te @ the 
y both jointly when great nicety is” 
ig+ 4, 18 the edge-bar bear ng the cutter D™ 
is made 
 Tefts on the equal bagi . and D, fixed 
the lever H Tis tapped fo as to receive the ferew of the a 
without fhake, to which it can be’adapted by the ene a 
ever has an oblong parla through it, in the 
direGion of its length from H nearly to I, ad 
M is 
rning on the i M fixed to the fliding plate, 
and fet fait. by he milled nut over any point of the cir- 
cular aperture N, as ae inclination may re is an 
endlefs ferew of flow motion, for regrlating nie aceuracy of 
the adjuftment to the point where the nut fixes the lever; 
and-T is a pin fixed in the lever L M, that aifée plein be 
the oblong apertures of lever HI, and gives motion to the 
fliding plate E F, whenever the ha nee turns the axis of the 
ferew, and as the cu tting point P Q is attached to this plate, 
by the cocks R and 5, it alfo moves with the fame velocity ; 
this velocity depend ts on the diftance of the pin T from. ne 
the centre of its motion, and may tHerefore be regulated 
by Bua nut L and {crew O L, to the requifite angular velo- 
city, t y fuit each turn of the handle, ‘or flees attached: 
to it by a ag piece between G and 
he agen of cutting the fufeé by this engine, it is 
prefumed, can require no further Fe maiai 
4. Fup. ss ig “ ld), ading by the union of a ae — 
pinion, a sere imple ae and a Siidin ng frame.— 
of the latt plate, exhibits erfpedtive view of the la. ee 
engine as given in aa eee ced pattern books; A. 
as: ‘before, . is the aes frame, and, E " the fliding frame, 
but infiead of dove-tailed edges this upper frame flides b 
means of four cylindrical pieces ‘ei through correfpond- 
ing holes in the edges of the lower frame, as feen in the. 
figure ; there is alfo an axis formed an a fcrew, turned . 
the handle, ating in the part H of the iaviible lever H I 
as before, which “lever lies ‘here under the fraines ; but 
wheel G ona feparate AXIS, ‘that carries the fufee, is acuat od 
the handle. fecon 
P ot 
cular holes in the fuperincumbent pice » fo as to lay. 
hold of the lever H I thr ncealed aperture in the 
from the 
point y 
while the: {crew > taking into the nut R, adjufts the 
fituation of the hole occupied by the mnilled nut . In 
all other refpects t he operation of cutting the fufee is the. 
aa as in the other engiries. Som etimes w e have, feen a 
w acting’ againft the fliding frame and ice between: 
me Hee pieces on the inner edge of the ‘under frame 
to prevent jerks, but when the {crew and other aCting parts 
are well- fitted, this is unneceflary. From thefe four ene. 
gines it is eafy to perceive, as we have obferved, that vari- 
ots other’modifications may be adopted to cae the fame. 
‘ purpofe. 
Fuser ‘Frame.--When a fufee has been cut’ by an engings - 
a is found on trial to have fome place or peal reas of too large 
groove, an 
ends of the frame, by means of a gro 
as the fufee ern the fai arbor Bn seaiee 
keeps the point of, the cutting tool’ in 
angles to the ‘arbor r of the — ahd 4 
