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The First Telephone- Replica bell’s

One of the most significant events in the history of human innovation took place on March 10 of 1876. On this date, Alexander Graham Bell spoke into the mouthpiece of a primitive telephone sending a message by wire to his assistant Thomas Watson. Also, check- STD full form

 Replica bell’s first telephone transmitter

This was the first telephone message. The telephone was born. I recently constructed. A working replica bell’s first telephone transmitter. If you have access to some basic tools and materials you may be interested in attempting this historically significant project.

 You can use bells’ actual notes to assist with the design. This image from his notebook dated 3/10/1876 shows his design for the first functioning telephone and describes that historic first phone call. He writes. 

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The first phone call

The improved instrument shown in figure one was constructed this morning and tried to see me. Mr. Watson was stationed in one room with the receiving instrument. He pressed one year closely against the receiver and closed his other ear with his hand. 

The transmitting instrument was placed in another room in which the doors of both rooms closed. I then shouted into the most paste the following sentence. “Mr. Watson comes here I want to see you.”

 To my delight, he came and declared that he had heard and understood what I said. This first phone call was accomplished with what bill called a liquid transmitter. 

Liquid transmitter.

What’s the analysis diagram. This is a battery. Current flows from the battery to a brass rod labeled P. in this diagram. The liquid is conductive allowing current to flow to a small wire W. which is attached to a membrane and suspended.

 So that it touches the liquid. Current then follow this path to the receiving instrument. It is an electromagnet with a movable armature S. The circuit is completed with this return to the battery. Speaking into the mouth he’s letting him on the diagram.

 Since sound waves down the tube causing the membrane to start vibrating. The membrane’s vibrations mimic the sound wave vibrations. The wire attached to the membrane also vibrates moving in and out of the liquid, this creates a varying resistance that causes the current to change with the vibration.

 This varying current modulates the strength of the electromagnet at the receiving instrument causing the armature to vibrate creating sound waves similar to the original spoken words.

 Let’s build one.

 This was my first attempt. This unit did not work at all I could do just the liquid level with any accuracy. This was my next and much more successful attempt. If you understand the basic principles of this liquid transmitter, you can probably design your own.

 The biggest challenge is trusting the contact between the vibrating wire in the liquid. I’ll explain the design that I came up with. 

The success of this unit was helped by an innovative idea for adjusting the liquid level from this site antique telephone history.com. 

I soldered a half-inch copper plumbing cap to a 1.5-inch. The bolt threads into a team. The team is inserted into a hole in the base of the transmitter with some copper wire contacting it and exiting at the bottom of the base. 

This wire is connected to one of the posts on the front of the base. I used a 1.5-inch KBS pipe to create the diaphragm holder. Used a section of the pipe coupler to hold the paper diaphragm in place.

 I use the backing paper from a sheet of labels for the diaphragm. This paper’s plasticized. The copper pulls over the sheet stretching it tightly. Next, we need to contact her with the metal wire that will contact the liquid.

 This is about 1.5 inches or 3 centimeters in length. I used 22 gauge night chrome wire to create this. We need to connect a very small gauge wire to this contactor. I used a piece of copper from a lamp cord.

 Sound vibrations

 I wrapped around a nail to give it some spring so it wouldn’t interfere with the sound vibrations. Next, I soldered one into the coil to the contactor. Next, I glued the short wire to the center of the diaphragm. Be careful, if you use this instant glow. It can damage arise includes can together.

 I drilled a large hole in the upper support for the plastic pipe. This whole has to be centered over the copper Cup. The plastic pieces push through the hole. I used a 1.5-inch copper to complete the disassembly. With the copper Cup in place mount the upper support.

 Make sure the contact is in the Cup but not touching the sides. Next, the small copper wires are connected to a bolt that extends through the back. These borders are then connected by a wire to the other post on the front of the device. That completes the basic construction. The **** is a typical 5 percent acetic acid. This is the liquid I will use in this device. I partially filled the Cup with a mentor. 

Next, I have to adjust the liquid level intelligence contact the contactor sure. This contact point can be found by trial and error when trying to do the final adjustment but a meter makes it much easier with a 6-volt battery pack.

 An ammeter in the circuit. You can see how interesting the cop affects the current. 0 million means the contractors are out of the liquid. I tried to find a point where the current bounced back and forth between 0 and 1 million. The contractor is just at the surface.

 Building Receiver

 Our transmitter is completed next we need a receiver. I opted to use a standard speaker an electromagnetic device. The signal though was so weak that I had to use a pair of amplified computer speakers. With the transmitter sitting indoors.

 I ran a length of wire off the front door and connected the speakers. Set the video camera, Jason, to the speakers and hit record. I return to the building closing doors behind me and then I spoke bell’s words from 1876 into the mouthpiece. Mr. Watson comes here I want to see you. 

These are the messages recorded from the liquid transmitter. What do you? The messages are painted muffled but it is a message generated by a replica of the first telephone. Mr. Watson probably heard something very similar to this. What do you? 

 Evolved from primitive beginnings into a sophisticated device

It is remarkable that Bell and Watson were able to accomplish this with the tools and technology in the late 18 hundreds. The telephone, of course, has evolved from these primitive beginnings into a powerful sophisticated device and I suspect Alexander Graham Bell was enough of a visionary to imagine the possibilities of even a phone.

 They could display and share his nineteenth-century. Drawing of that first telephone. As I mentioned if you attempt this project adjusting the interface between the liquid and the wire contactors is difficult.

 Also, the signal is weak and you will probably need amplified speakers to hear any transmitted sounds. Do not attempt this project if you are unfamiliar with safety issues when working with electricity.

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