Sound-proor Telephone Cabinet.
Year: 1899

page_text: Date of Application, 19th July, 1899-Accepted, 19th Aug., 1899
Sound-proor Telephone Cabinet.
We, HANS PETER JOACHIM WULFF, Master Cabinet Maker, 42, Christian-
strasse, Neumünster, Germany, and JOHAN HINRICH BLUNCK, Master Carpenter,
70, Haart, Neumünster, aforesaid, do hereby declare the nature of our said
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement: -
In this invention which shews a sound proof telephone cabinet, a material is
used for padding the walls which is eminently adapted for the purpose indicated
inasmuch as in spite of the cheapness it possesses unusually great inpenetrability.
The material used for this purpose is shoddy obtained from cloth refuse, rags
etc., which is used in cloth weaving but the cloth woven from it is not thoroughly
durable and on that account is only used by reason of its cheapness. This
material is in the present instance used to prevent the passage of sound from
the interior to the exterior of the cabinet and experience proves that no other
material has such power to deaden sound as this fibrous wool. At the same time
another improvement is introduced into this cabinet, in addition to the wall
padding by its being constructed to take to pieces for eventual removal the
several parts being joined together by springs or other contrivances so as to come
apart easily.
Finally yet another device is introduced for the purpose of lighting up the
dark chamber by an electric light switched on when the receiver is taken down
without necessitating the employment of a separate switch.
In the accompanying drawing
Figure 1 shews the cabinet in front elevation with the door open.
Figure 2 is a ground plan with the door shut.
Figures 3 & 4 shews the switching apparatus of the electric light on a larger
scale.
The new telephone cabinet may when suitably ornamented be introduced into
a room as a decorative piece of furniture. It is as mentioned above padded
with shoddy and made to take apart at the corners to facilitate removal."
For the purpose of automatically switching on an electric light the hook 6 on
which one of the receivers is hung when the instrument is not in use is used as
shewn in Figures 3 and 4 for the purpose of turning a contact lever c when the
receiver is taken down, which connects the contacts d and e in order to remove
the interruption of the current and to switch on the electric light. A small
writing desk fmay be fitted to the cabinet in the usual way to enable the person
speaking to take notes. When the conversation is ended on hanging up the
receiver the connection of the two contacts & and e is again interrupted and the
light is switched off.

page_text: 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:
CLAIM.
A sound proof telephone cabinet capable of being taken to pieces the walls of
which are padded with shoddy and in which the hook (b) for the reception of the
receiver (a) used as a switch switches on an electric light in the manner sub-
stantially as herein set forth and as shewn.
CLAIM.
A sound proof telephone cabinet capable of being taken to pieces the walls of
which are padded with shoddy and in which the hook (b) for the reception of the
receiver (a) used as a switch switches on an electric light in the manner sub-
stantially as herein set forth and as shewn.
HANS PETER JOACHIM WULFF and
JOHAN HINRICH BLUNCK,
By George Barker,
Fellow of the Chartered Institute of Patent Agents,
Agent for Applicants, 77, Colmore Row, Birmingham.