Telegraphy and Telephony


 

 

 

 

 

 
 

MODEL OF A COUPLE OF COMPLETE MORSE STATIONS


  Function
  To show how the transmission and reception of the telegraphic signals happen.
Maker:
Officine Galileo - Florence
Price: L 1050 Purchase date: 1931

  Description
  The two stations are placed symmetrically on two bases with foot, and include: a dry cell, a key, a schematic Morse receiver apparatus. All the connections are visible.

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HUGHES MICROPHONE


  Function
  To show the functioning of a carbon microphone.
Maker:
Officine Galileo - Florence
Price: L 75 Purchase date: 1931

  Description
  It is the classic model with only one carbon spindle. The mobile vertical carbon is held between two cylinders, one of them is fixed to the basis and the other is held by the fir-wood table, and its height can be regulated with screws with a clasp button.
  The connections are all visible. The base stands on rubber feet. It can be connected in series to a receiver and to a cell. The mobility of the carbon spindle must always be regulated by moving the upper screw that is fixed with the clasp button after reaching the greatest efficiency.

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MICROPHONE FOR RADIO COMMUNICATION


  Function
  To show the functioning of a carbon microphone.
Maker: Unsigned Price: Purchase date: 1932

  Description
  The metallic basis is fixed to a wooden case on which a dial lamp is placed to indicate the microphone state. From the basis rises a metallic bar on which a circle is welded. The microphone is held by four springs in the centre of the circle to avoid the noises due to spurious oscillations.

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DEMOUNTABLE TELEPHONE


  Function
  It is a true demountable bipolar telephone.
Maker:
Western Electric - Usa
Price: L 80 Purchase date: 1931

  Description
  The case and the ebonite handset are used only as a protection, because the magnet with the two coils wound on the iron core are joined to a brass funnel, on the edge of which lies the vibrating iron diaphragm. When reassembled, the telephone functions as before.

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HEADPHONES


  Function
  To receive radiotelephonic calls.
Maker:
Neufeldt & Kuhnke - Kiel
Price: L 50 Purchase date: 1931

  Description
  The headphones have a great resistance, to use with slide-wire bridges and for telephony. It has special lamellar magnets. One of the pole is in the centre of the telephonic case; the other, in double, magnetizes an iron ring, on which lies a vibrant sheet.

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MODEL OF DOUBLE TELEPHONE STATION PLANT


  Function
  To show the functioning of the telephonic apparatus.
Maker:
Officine Galileo - Florence
Price: L 1400 Purchase date: 1931

  Description
  The microphone has three carbons, a bell supplied by a cell, a receiver, switches, a transformer and all the connections are placed on two symmetrical tables, that represent the complete telephonic places.
  The circuit of the bell inside the microphone and the external circuit of the receiver are made distinct by a different colouration.

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