US1470430A - Telephone amplifier system - Google Patents

Telephone amplifier system Download PDF

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Publication number
US1470430A
US1470430A US594850A US59485022A US1470430A US 1470430 A US1470430 A US 1470430A US 594850 A US594850 A US 594850A US 59485022 A US59485022 A US 59485022A US 1470430 A US1470430 A US 1470430A
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Prior art keywords
amplifier system
telephone
mine
telephone amplifier
earthed
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Expired - Lifetime
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US594850A
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Ellison Michael Chetwynd
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Individual
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Individual
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Priority claimed from GB2560421A external-priority patent/GB190793A/en
Application filed by Individual filed Critical Individual
Priority to US594850A priority Critical patent/US1470430A/en
Application granted granted Critical
Publication of US1470430A publication Critical patent/US1470430A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
    • H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy

Definitions

  • This invention consists principally in a system of telephony without the need of special connecting wires and intended more especially for use in mines, and the like, the said invention providing means by which telephonie communication can be carried on, by means of telephonie or like, apparatus, without the' necessity for connecting wires between such apparat-us.
  • I employ two carths. or two carthed metallic conductors, oran earth and an earthed metallic conductor, (which. for brevity, I will refer to as the earths) as the means for obtaining the required communication so that conversation can be carried on between places at a distance apart in a mine, or the like, or between the mine and the surface above, or the entrance to, the mine, or the like.
  • the transmitting apparatus employed in accordance with this invention may comprise a direct current circuit with a microphone therein to cause fluctuations in the current and flowing between the two earths, or a circuit with a current (having fluctuations caused therein by a microphone) transformed from the current passing between two earths such, for instance, as carthed meallie conductors constituted by pipes; for example, haulage ropes compressed air pipes. or water-pipes, where such are available, or wire haulage ropes.
  • the receiving apparatus ' may comprise an audio frequency three electrode thermionic valve amplifier, the input terminals of which are connected to two earthed conductors preferably the same as those to which the transmitter is connected although this is not essential.
  • I may employ any required number of valves. and any type of three electrode receiving valve andaudio frequency intervalve closed iron core transformers arranged in any .suitable manner, or any other amplifying device may be employed.
  • the receiving connection can be m'eomplidied by transformers connected in the earth circuit and ringing up can be effected by means of a. relay.
  • Figures l and 2 illustrate diagrannnaticallyr how telephonie systems may, in aecor( ance with my invention, be applied t0 a mine from which its analogous applications will also be understood.
  • Figurc illus trates diagrammatically, a combined transmitting and receiving apparatus suitable for use in accordance with my invention.
  • the combined transmitting and receiving appa 'atus is mounted, or fixed, in any suitable, or required position in the mine, each apparatus being preferably compaetly arranged within a portable box indicated at A in Figures 1 and 2, to protect the appas ratusl from injury and allow of its being easily moved from placel to place.
  • each apparatus may be connected to earthed plates D and D as shewn in Figure 2, so that both the outgoing and ingoing currents are conducted from one apparatus to another bv earth.
  • the combined transmitting and receiving apparatus shewn diagrammatieally in Figure 3 comprises an audio frequency three electrode valve amplifier, having two valves E, and F, connected in cascade by means of iron-cored inter-valve transformers G.
  • the two earthed metallic conductors and (I, are connected to the input terminals b and al of this amplifier, which so ampli ties the faint electrical impulses as to make them clearly audible.

Description

Oct. 9, 1923.
M. C. ELLISON TELEPHONE AMPLTFIER SYSTEM Filed 06t- 16 1922 2 Sheets-Sheet 1 A Hna,
um o wm E QJ@ m wd f, E
Oct. 9, 1923.
M. C. ELLISON TELEPHONE AMPLIFIER SYSTEM .n lo
llvs/.E/Y'l'lJ MICHAEL C ELL/SON Patented Get. 9, H523.
UHTE STTES MICHAEL CHETWYND EILISON, OF HUTTONS, ENGLAND.
TELEPHONE AMPLIFIER SYSTEM.
Application filed October 16. 1922.
To n?? fief/0m. t may concern.'
Be it known that l, MICHAEL CHETWYND Emisora, a subject ot' the King of Great Britain, residing at Huttons Ambo Hall, in the county of York, llngland, have invented new and useful Improvements in Connection with Telephone Amplifier Systems, of which the following is a specification.
This invention consists principally in a system of telephony without the need of special connecting wires and intended more especially for use in mines, and the like, the said invention providing means by which telephonie communication can be carried on, by means of telephonie or like, apparatus, without the' necessity for connecting wires between such apparat-us. I employ two carths. or two carthed metallic conductors, oran earth and an earthed metallic conductor, (which. for brevity, I will refer to as the earths) as the means for obtaining the required communication so that conversation can be carried on between places at a distance apart in a mine, or the like, or between the mine and the surface above, or the entrance to, the mine, or the like.
The transmitting apparatus employed in accordance with this invention may comprise a direct current circuit with a microphone therein to cause fluctuations in the current and flowing between the two earths, or a circuit with a current (having fluctuations caused therein by a microphone) transformed from the current passing between two earths such, for instance, as carthed meallie conductors constituted by pipes; for example, haulage ropes compressed air pipes. or water-pipes, where such are available, or wire haulage ropes. The receiving apparatus 'may comprise an audio frequency three electrode thermionic valve amplifier, the input terminals of which are connected to two earthed conductors preferably the same as those to which the transmitter is connected although this is not essential.
I may employ any required number of valves. and any type of three electrode receiving valve andaudio frequency intervalve closed iron core transformers arranged in any .suitable manner, or any other amplifying device may be employed.
n the combined transmitting and receiving apparatus the receiving connection can be m'eomplidied by transformers connected in the earth circuit and ringing up can be effected by means of a. relay.
Serial No. 594,850.
The follo\\'ing is an explanation with reference to the accompanying drawings, of how my invention can be performed, but I do not limit myself to the precise details hereinafter described and illustrated.
Figures l and 2 illustrate diagrannnaticallyr how telephonie systems may, in aecor( ance with my invention, be applied t0 a mine from which its analogous applications will also be understood. Figurc illus trates, diagrammatically, a combined transmitting and receiving apparatus suitable for use in accordance with my invention.
The combined transmitting and receiving appa 'atus is mounted, or fixed, in any suitable, or required position in the mine, each apparatus being preferably compaetly arranged within a portable box indicated at A in Figures 1 and 2, to protect the appas ratusl from injury and allow of its being easily moved from placel to place.
In the arrangements illustrated in Figures l and 2 three boxes A, are shown in position, each containing transmittingr and receiving apparatus, but any desired number of such boxes can of course be employed. The electrical circuit from one apparatus to another is, in the arrangement shewn in Figure 1, shewn as being effectedi by connecting one of the two electric mains of the respective appa` ratus to any suitable metallic pipe B, or the like, in the shaft C of the mine and con` necting the other of the two electric mains of the respective apparatus to earth through the earthed plates D, or, if desired, the last mentioned electric mains may be connected to another metallic pipe, or the like in the mine. Instead of connecting either of the mains to a pipe, or the like, the electric mains ot' each apparatus may be connected to earthed plates D and D as shewn in Figure 2, so that both the outgoing and ingoing currents are conducted from one apparatus to another bv earth. l
The combined transmitting and receiving apparatus shewn diagrammatieally in Figure 3 comprises an audio frequency three electrode valve amplifier, having two valves E, and F, connected in cascade by means of iron-cored inter-valve transformers G.
is a step down telephone transformer. The two earthed metallic conductors and (I, are connected to the input terminals b and al of this amplifier, which so ampli ties the faint electrical impulses as to make them clearly audible.
rent mi @animi "in 'istmfmy "whereof have sgne my mun@ im this Spscicnmn m *ne presence of ivm Suwcmbmg wltnesscs.
EHCHAEL CHETWVT'D ELS N.
Q3 'WmiAM CUm'i', DOROT Anmfama HAZELL.
US594850A 1921-09-27 1922-10-16 Telephone amplifier system Expired - Lifetime US1470430A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US594850A US1470430A (en) 1921-09-27 1922-10-16 Telephone amplifier system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2560421A GB190793A (en) 1921-09-27 1921-09-27 Improvements in connection with telephonic systems, or apparatus, more especially intended for use in mines, and the like
US594850A US1470430A (en) 1921-09-27 1922-10-16 Telephone amplifier system

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US1470430A true US1470430A (en) 1923-10-09

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418104A (en) * 1943-08-16 1947-03-25 Asea Ab Signaling arrangement in a cable system
US2568241A (en) * 1944-11-08 1951-09-18 Philip W Martin Apparatus for logging
US2992325A (en) * 1959-06-01 1961-07-11 Space Electronics Corp Earth signal transmission system
US3129394A (en) * 1958-03-17 1964-04-14 Texas Eastern Trans Corp Coaxial mode transmission of carrier currents using insulated buried pipe and surrounding earth
US3191122A (en) * 1961-12-01 1965-06-22 Seismograph Servier Corp Communication system for sielded areas
US3406342A (en) * 1965-01-21 1968-10-15 Hubner Rolf Safety monitoring and acknowledgment system for subterranean structures using radio relays
US20040124994A1 (en) * 2002-10-07 2004-07-01 Baker Hughes Incorporated High data rate borehole telemetry system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418104A (en) * 1943-08-16 1947-03-25 Asea Ab Signaling arrangement in a cable system
US2568241A (en) * 1944-11-08 1951-09-18 Philip W Martin Apparatus for logging
US3129394A (en) * 1958-03-17 1964-04-14 Texas Eastern Trans Corp Coaxial mode transmission of carrier currents using insulated buried pipe and surrounding earth
US2992325A (en) * 1959-06-01 1961-07-11 Space Electronics Corp Earth signal transmission system
US3191122A (en) * 1961-12-01 1965-06-22 Seismograph Servier Corp Communication system for sielded areas
US3406342A (en) * 1965-01-21 1968-10-15 Hubner Rolf Safety monitoring and acknowledgment system for subterranean structures using radio relays
US20040124994A1 (en) * 2002-10-07 2004-07-01 Baker Hughes Incorporated High data rate borehole telemetry system
US7228902B2 (en) * 2002-10-07 2007-06-12 Baker Hughes Incorporated High data rate borehole telemetry system

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