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Telecom Milestones

 WIRELESS COLLECTION

WIRELESS RECEIVER TUNNING COILS

LOOSE COUPLER TRANSFORMER  WITH

 

TUNNING ON THE PRIMARY AND SECONDARY

These tuning coils were used to build Crystal Detector Wireless Receivers, in the early days of Wireless Telegraph.

 

The frequency range covered the long and medium waves.

TUNING COIL WITH TWO SLIDERS

 

 

CRYSTAL DETECTORS

 

Point contact assembly

and GALENA crystals

IGNITION COIL OF FORD "MODEL"T" Automobile.

It was one of 4 plug-in coils in a wood box, which ignited the 4 cylinders engine. 

At the beginning of the 20th century, experimenters and hobbyists have built home-made Wireless Telegraph spark-gap transmitters from parts that were available at specialized stores.

 

The FORD T ignition coil was used by many for supplying the high voltage pulses to the spark gap circuit.

 

The picture at the right shows an example of amateur wireless telegraph spark-gap transmitter of those days.

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