Πολλοί ήταν εκείνοι που προσπάθησαν

Πολλοί ήταν εκείνοι που προσπάθησαν να κατασκευάσουν ένα μηχάνημα που θα μπορούσε να μεταβιβάσει τον ήχο διαμέσου του ηλεκτρισμού. Αυτό το κατάφερε ο Αμερικανός φυσικός Αλεξάντερ Γκράχαμ Μπελ το 1876.[1] Η συσκευή που χρησιμοποιήθηκε περιελάμβανε μια ελαστική μεμβράνη από σίδηρο, η οποία βρισκόταν μπροστά από σιδηρομαγνητικό πυρήνα, περιτυλιγμένο με μονωμένο αγωγό. Μια γραμμή από δυο καλώδια συνέδεε τη συσκευή αυτή με μια άλλη παρόμοια. Και οι δυο συσκευές χρησιμοποιήθηκαν ως δέκτες και ως πομποί. Στη συσκευή του Μπελ η φωνή έπεφτε πάνω στη μεμβράνη και την έκανε να πάλλεται. Η συσκευή αυτή χρησίμευε μόνο για ομιλίες σε κοντινή απόσταση.

Μετά την εφεύρεση όμως του μικροφώνου από τον Αμερικανό Ντέιβιντ Χιουζ (David Edward Hughes) το 1877, το τηλέφωνο άρχισε να εξελίσσεται και να χρησιμοποιείται για τη σύνδεση μακρινών αποστάσεων. Το μικρόφωνο αυτό περιλάμβανε μικρή ράβδο από άνθρακα η οποία περιβαλλόταν από δυο στρώματα άνθρακα. Στην αρχή μικρόφωνο και ακουστικό ήταν τοποθετημένα μαζί. Το τηλέφωνο πέρασε διάφορες εξελίξεις για να φτάσει στη σημερινή του μορφή.

Στα χειροκίνητα τηλεφωνικά κέντρα ο συνδρομητής για να καλέσει το κέντρο έστρεφε μια μαγνητοηλεκτρική μηχανή που είχε το τηλέφωνό του και η τηλεφωνήτρια ρωτούσε τον συνδρομητή με ποιον αριθμό θέλει να μιλήσει. Στα ημιαυτόματα τηλεφωνικά κέντρα ο συνδρομητής συνδέεται με το κέντρο αμέσως μόλις σηκώσει το ακουστικό.

Τα αυτόματα τέλος τηλεφωνικά κέντρα είναι η πιο εξελιγμένη μορφή που χρησιμοποιείται σήμερα σ' όλο τον κόσμο. Ο συνδρομητής, χωρίς να έχει καμιά επαφή με το κέντρο, μπορεί να μιλήσει απευθείας με τον αριθμό που ζητάει.

Αποτελέσματα (Αγγλικά) 1:

Many were those who tried to build a machine that could transmit sound through electricity. This managed the American physicist Alexander Graham Bell in 1876.[1] the device used consisted of an elastic membrane of iron, which was located in front of sidiromagnitiko core, surrounded with insulated ductwork. A line from two cables connected that device to another similar. Both devices were used as receivers and transmitters. In Belle's voice device fall onto membrane and made her pulsing. This device was used only for talks within walking distance.But after the invention of the microphone by the American David Hughes (David Edward Hughes) in 1877, the phone began to evolve and be used for the long-distance connection. The microphone this involved small carbon rod which was surrounded by two layers of coal. At the beginning of microphone and earpiece were mounted together. The phone went through various developments to reach in its current form.To manually call centers the Subscriber to call the Center turned a magnitoilektriki machine that had his phone and the operator asked me what number the Subscriber wants to talk. In semiautomatic call centers the Subscriber connects to the Center as soon as you pick up the handset.Automatically end the call centers is the most sophisticated form used today throughout the world. The Subscriber, without having any contact with the Center, can talk directly with the number of requests.

Αποτελέσματα (Αγγλικά) 2:

Many were those who tried to build a machine that could transmit sound through electricity. This manages the American physicist Alexander Graham Bell in 1876. [1] The apparatus used consisted of a rubber membrane of iron, which was located in front of a ferromagnetic core, wrapped with insulated conductor. A line of two wires connected to this device with another like. Both devices were used as receivers and transmitters. In the apparatus of the voice Bell fell on the membrane and made ​​to vibrate. This device was used only for speeches nearby. After the invention but the microphone from the American David Hughes (David Edward Hughes) in 1877, the phone began to evolve and be used to connect long distance. The microphone is included small rod of carbon surrounded by two carbon layers. At first microphone and headset was put together. The phone had multiple developments to reach its current form. In manual telephone exchange subscriber to call center estrefe a magnetoelectric machine that had his phone and the telephone operator asking the subscriber to which number he wants to talk. In semi-automatic telephone exchange, the subscriber is connected to the center soon pick up the handset. The automatic end call centers is the most advanced model currently used around the world. The subscriber, without having any contact with the center, can speak directly with the number who asks.

Αποτελέσματα (Αγγλικά) 3:

There were many people who tried to build a machine that could transfer the sound through the electricity. This was the American physicist Alexander Graham Bell in 1876.(1) The device used was a flexible film of iron, which was in front of ferromagnetic core, encased in insulated conductor.A line of two wires linked the device to another similar. And the two devices used as receivers and transmitters. The device with the Belle voice went down onto the film and made to vibrate.This device is used only for speeches within walking distance.c) After the invention but the microphone from us David Χιουζ (David Edward Hughes) in 1877,The telephone began to evolve and be used for the connection long-haul. This microphone included small rod of coal surrounded by two carbon layers.In principle microphone and headphone was fitted together. The telephone has passed various developments to reach its present form.

To manually call centers the subscriber to call the center would turn a μαγνητοηλεκτρική machine which had the phone and turned to ask the subscriber to whom number wants to speak.In semi-automatic call centers the subscriber is connected to the center as soon as the phone off-hook.c) automatic end call centers is the most advanced form used today throughout the world.The subscriber, without having any contact with the center, can speak directly to the number requested.