340 
WATKIN’S ON MAGNETO-ELECTRIC INDUCTION. 
ratchets, and quadrants, the whole of which 
have been already explained in the reference 
to fig. I. The spaces marked by the dotted 
lines are the knee-frame, c, c. And the bed- 
rest, H, H. The circle marked, x,is the aper- 
ture in the platform under which the bed-pan 
is placed. 
Fig. 4, is a section of the bed-frame at the 
head board, a, b, shews the two cylinders, 
c, D, the side posts (marked b in fig. 1 ) e is the 
roller extending across the bed-frame by which 
the bed-rest, f, f, is raised, g, is a portion 
of the quadrant ; the double black line shews 
the concave platform, the diagonal lines shew 
the bearers of the platform, those bearers 
resting upon the bed-frame; the top dotted 
line from the cylinders shews the line of sack- 
ing when strained by the springs and free 
from the pressure of the body ; the other 
lines shew different degrees of compression by 
the body according to its weight or the 
strength with which the springs are set up. 
Fig. 5, shews a section of the foot board 
platform, and knee-frame. 
Fig. C, represents a portable bed-rest affix- 
ed on the bedstead as it may be wanted 
occasionally, a, is a frame of brass or other 
metal supported by a standard (also of metal) 
marked, b, which is secured to the outside of 
the bed-frame at, f. The frame, a, is at- 
tached to the standard, b, by a pivot on which 
it turns, c, is a quardrant by which the bed- 
rest is raised at the head, actuated by a roller 
and strap, o. e, shows the lied-rest when 
elevated ; a coi responding frame is on the 
other bed-post, and the two are connected at 
the head by a board marked, a, fig. 7. To 
the board, a, are fixed two quadrants, c, c, 
fig. 7, actuated as has been already explained 
by the roller, b, fig. 7, and d, fig. 6. The 
upper bar of the frame runs parallel with the 
top of the cylinder. A sacking is laid across 
from cylinder to cylinder, and, passing over 
the top bars of the frame is fastened to the 
lower bar by straps upon studs, which are 
described by the four dots. 
Fig. 7, shews the head of the portable bed- 
rest. A, is the board connecting the two 
metal side frames, b. is the roller, c, c, the 
quadrants, d, d, shews the ends of the metal 
side-frames which sweep round the tops of 
the cylinders from, f, to h. e, e, are the top 
bars. F, F, the lower bars and studs, g, is 
the sacking of the bed-rest, extended across 
the bedstead, and strapped to the studs of the 
lower bars, f, f. 
'J he bed sacking, as before stated, is required 
three times the width of the bedstead ; in the 
sacking are two apertures each correspond- 
ing with that in the platform, x, fig. 3. 
These apertures are four feet distant from 
each other, or two feet each from the centre, , 
so that when the sacking is stretched across, 
one aperture appears on each cylinder. When 
the bedstead is preparing for use, care must 
be taken to have one aperture in the sacking 
immediately over that in the platform. This 
will cause more sacking to be on one cylinder 
than on the other, and it is on that side that 
the change bedding is to be made up, and 
which is denoted to tlie attendant by a red 
mark on the sacking at tlie foot of the c\ Un- 
der when a change of bedding is effected, the 
other aperture is over the centre and the bulk 
of sacking is on the opposite cylinder, whiclj 
is also denoted by the red mark, l lris is an 
infallible guide to the attendant to that side 
on which the change bed is to be made up, 
tor was it to be made upon the wrong side, 
there would not be a sufficiency of sacking 
to permit the change to be completed. 
For evacuation, the bed or mattress has an 
aperture in it corresponding with the others. 
This is closed by a cushion to fit when not 
wanted, the bed-pan slides under the bedstead 
immediately under the aperture, x, fig. I. 
When wanted for use. revolve either cylinder 
till the patient is placed on his side, the 
cushion is then taken out, and the body re- 
placed on the back. 
Having thus described the nature of my 
invention, and the manner of constructing 
and using the same, I would observe that I 
lay no claim to any of the parts separately of 
which the apparatus is composed, they being 
separately well known and in use. 1 there- 
fore only claim as my invention the application 
of the above combination of mechanical 
powers to a new and specific purpose, as 
herein represented and described, without 
confining myself to the use of any particular 
mateiial, or any particular fashion in the 
construction of the apparatus.— In witness 
whereof, &c. 
Enrolled July 15, 1835. 
MAGNETO-ELECTRIC INDUCTION. 
By Mr. F. Watkins. 
The production of motion by magneto- 
electricity is not new, many philosophers 
having already suggested and prepared vari- 
ous mechanical contrivances by which a body 
might be made to move continuously by mag- 
neto-electric agency. 
Among the contrivances with which I am 
acquainted, none can vie, either in simplicity 
or in beauty of design, with that which ema- 
nated from the ingenuity of Mr. Saxton. The 
instrument as originally constructed by him 
may be daily seen in operation at the Gallery 
of Practical Science in Adelaide Street. 
Having been, as you know, for a long time 
extensively engaged in the construction of 
electio-dynamic and magneto-electrical ap- 
paratus, on seeing Mr. Saxton’s machine,!, 
with his permission, immediately commenced 
making one nearly after his fashion, and af- 
terwards conceived that it might be made to 
show an increased number of phenomena. 
Following out my ideas experimentally, I ob- 
tained distinct revolutions from eight magne- 
tic needles, together with the vibration of a 
ninth. 1 am not aware that a multiplication 
of motion to this extent has been achieved be- 
fore ; indeed, by applying a second electro- 
magnetseventeen bodies might be put in mos. 
tion at the same time, and by a judicious ar- 
rangement even more. 
