Improved Appliance for Localizing the Position of Seating Blocks or Hidden Connections Embedded in Plaster or the like.
Year: 1894

page_text: Date of Application, 3rd Feb., 1894
Complete Specification Left, 23rd Apr., 1894 Accepted, 2nd June. 1894
PROVISIONAL SPECIFICATION.
Improved Appliance for Localizing the Position of Seating Blocks
or Hidden Connections Embedded in Plaster or the like.
I FRANCIS JOHN MUDFORD 2 Jackson Road Holloway London, N. Electrical
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention consists in an improved appliance for enabling the position of
seating blocks for electric bells or gas pipes, or hidden bell or electric light wires,
gas or other pipes embeded in plaster, stucco, or the like to be readily found. To
this end I so form a suitably shaped block preferably of wood as that a magnet may
be sunk therein or attached thereto, or in the case of electric bell or electric light
wires, I employ and connect thereto a suitably shaped magnet. The blocks thus
formed and fitted are nailed or screwed to plugs driven into the wall in the usual
manner, before the plaster stucco, or the like is laid on. The locality of the blocks,
hidden wires, or other connections is readily found by running a compass or
galvanometer needle suitably mounted along the wall until a deflection is obtained
due to the influence of the hidden magnet.
Dated 3rd day of February 1894
FRANCIS M. ROGERS,
Agent.
COMPLETE SPECIFICATION.
Improved Appliance for Localizing the Position of Seating Blocks
or Hidden Connections Embedded in Plaster or the like.
I, FRANCIS JOHN MUDFORD 2 Jackson Road Holloway London, N. Electrical
Engineer, 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 :-
To
My invention consists in an improved appliance for enabling the position of
seating blocks for electric bells or gas pipes, or hidden bell or electric light wires,
gas or other pipes embeded in plaster, stucco or the like to be readily found.
this end I so form a suitably shaped block preferably of wood as that a magnet may
be sunk therein or attached thereto, or in the case of electric bell or electric light
wires, I employ and connect thereto a suitably shaped magnet. The blocks thus
formed and fitted are nailed or screwed to plugs driven into the wall in the usual
manner before the plaster, stucco or the like is laid on. The locality of the blocks,
hidden wires or other connections is readily found by running a compass or
galvanometer needle suitably mounted, along the wall until a deflection is obtained
due to the influence of the hidden magnet.
To enable my invention to be more clearly understood, I will now describe the
same more particularly by means of the drawings in which :-
Fig. 1. is a back view of the magnetic seating block, the plaster not being
shewn.
Fig. 2. is a vertical side section on line A B Fig. 1.
Fig. 3. shews a seating block such as may be employed for fixing gas brackets
having a magnetic bar stapled thereon.
Fig. 4. is a plan shewing the seating block fastened with magnetic wall nails.
Fig. 5. shews method of localizing lead or compo. pipes and electrical wires.

page_text: In the drawing, 1, is the zinc or other metal tube commonly employed for running
electric bell or light wires, the end of which is sunk in a groove 2, formed in the
block. 3, are the insulated wires. 4, Fig. 2, is the plaster in which the block 5 is
sunk, this block is by preference bevelled at the top and bottom, so that the plaster
as well as the floor brads 8, help to hold it in position. 6, shews the mortar joints
into which is generally driven a wooden plug, whereby it is usual to attach such
blocks by means of nails or screws securely to the wall. 7, is the magnet, this is
generally sunk in a saw cut or slit formed in the block, or it is driven in.
Figs. 1 and 2 it is shewn at the top of the block, it may however be sunk on one
side or on both sides, see Fig. 3, or stapled on in front of the block as at 7b, or it
may occupy any other suitable position upon, within or near to the block; or
magnetized brads 7", preferably coloured so as to determine their polarity, may be
driven by the side as in Fig. 4, or through the block.
The operation of my invention is as follows
1-
In
As is well known, it is not easy to ascertain the position of seating blocks sunk
in the wall plaster in the manner heretofore employed; such blocks have generally
to be found by probing with a bradawl or needle which disfigures the walls and
involves much waste of time. The position of a seating block containing a magnet
or magnets, or secured by magnetic nails may at once be found by the employment
of a simple compass or galvanometer needle 8" see Fig. 2, which is instantly
deflected on approaching either pole of the magnet.
In a similar manner the position of electric bell or light wires, lead or compo.
pipe embeded in plaster may be found by driving in magnetic nails, or by
employing a suitably shaped bar magnet 7 as shewn in Fig. 5.
may sometimes
secure the magnet by staples or tacks upon the blocks so as to permit of its being
removed and used again, see Fig. 3, 7.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination with a seating block for embedding in plaster, stucco or the
like and employed for fixing electric bell pushes, gas or electric light connections,
of a magnet, for the purpose of indicating the position of said block in the way and
manner described.
2. In a seating block the particular method of securing the magnet shewn in
Figs. 1, 2 and 3, by inserting it in a slit or cut, or attaching it to the block by
tacks, screws or staples, as shewn and described.
3. For the purpose of localizing the position of electrical wires, composition or
lead pipes concealed in plaster, cement, stucco or the like, the use and employment
of a magnet operating as described.
Dated 02-1 1004
FRANCIS M. ROGERS,
Agent.