Year: 1886

page_text: We CORDNER ALLEN AND COMPANY (Limited) of 20 Bucklersbury in the City
of London Engineers and Electricians, THOMAS MARSHALL COLLET Managing
Director to the said Company, HAROLD COLLET, Secretary to the said Company
and GEORGE LUANDERS of 90 Worship Street in the County of Middlesex Elec-
trician do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement:-
The object of this Invention is to provide means for facilitating the transmission
of Acoustic vibrations in the class of telephones commonly known as acoustic or
mechanical telephones. The first part of the Invention relates to means for sup-
porting the line so that it can be conveniently fixed and if desired be diverted
from a straight line whilst still maintaining a very efficient conveyance of the
vibrations therealong. With this object we employ a stem rod or wire with an eye
or loop through or over which the line is passed the said stem or the like being
secured to its bracket or support by a yielding or cushioned connection arranged
as a fulcrum as hereinafter described. The second part of the Invention relates to.
the diaphragms by which the vibrations are transmitted to and received from the
line, the said diaphragms being made from sheets consisting of wood or equivalent
material the said sheets being placed (and if desired cemented) face to face with
the grains of the respective sheets disposed angularly or crosswise with respect to
each other.
And in order that our said Invention may be fully understood we shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed sheet of drawing the same letters of reference
indicating corresponding parts in all the figures.
Figure 1 illustrates in section a support for the line constructed or arranged
according to this Invention, A is a plate or bracket of metal or wood or any other
suitable material secured to the wall or other place at which the line is to be sup-
ported. B is a rod wire or stem with an eye loop or hook b at one end through
which the line C is passed and with a disc nut or enlarged part 63 at the other end.
Between the back face of the part 62 and the wall X or other surface to which the
plate or bracket A is secured is placed a washer or piece D of India rubber gutta

page_text: percha or other springy or yielding material and between the front face of the
part 6 and the plate or bracket A is placed another disc or ring D of india rubber
gutta percha or other springy or yielding material-Similar material may also if
desired be used as a bush or collar (as shewn at D³) for the hole in the plate or
bracket A through which the rod stem or wire B passes but this is not essential-
Figure 2 shows the end of the rod stem or wire B with a ring or eye piece b³ of
metal porcelain, wood, ebonite or equivalent material for the line to pass through
in place of the plain loop shewn in Figure 1-The yielding material may be
separate pieces or two or more of them may be formed or connected together or
they may be replaced in whole or in part by blade or other springs of metal-The
washer D may in some cases be dispensed with.
1
Figures 3 and 4 illustrate in front view and transverse section a diaphragm
made according to this Invention-Sheets of thin wood such as sycamore or birch
or equivalent fibrous or grained material are put face to face and if necessary
cemented together with the fibres or grain arranged crosswise or angularly to each
and; the diaphragm is cut or formed from these sheets. In Figure 3 the portions
of the two sheets forming the diaphragm are marked E E¹, a portion of E¹ being
broken away to shew the other sheet below it-More than two sheets may be used
if desired, each sheet baving its fibre or grain arranged angularly or crosswise of
the adjacent sheet or sheets. A sheet or sheets of paper or equivalent grainless
material (preferably of a stout substance) may be used in addition to the sheets of
wood before described being cemented to either or both faces or between the sheets
of wood or the like. The diaphragm is mounted in any suitable or ordinary
support box or frame which will allow it to vibrate or be influenced by the air
w&ves.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
1st A support for the line of acoustic or mechanical telephones consisting of a
rod stem or wire with an eye ring hook or loop at one end and a disc nut or pro-
jection at the other end secured in a plate bracket or support with the intervention
of springy or yielding material or springs substantially as herein before described
and illustrated by Figures 1 and 2 of the accompanying drawings.
2nd A diaphragm for acoustic or mechanical telephones constructed of sheets of
wood or equivalent material placed (and if necessary cemented) face to face and
arranged with their fibres or grains crosswise or angularly disposed with respect to
each other substantially as hereinbefore described.
T: 01
T1000