Semaphore Signalling

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SEMAPHORE FLAG SIGNALING SYSTEM
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What Is Semaphore Signal & How It Works | Full Details | By The Rail News

Hello friends in this video I will tell you about the Semaphore Signal of indian railways in this video I will explain you in the easiest method that what is Semaphore Signal & How It Works In Full Details why they are used & where they are used now to know more watch this video.....

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In earlier days, Semaphore signals were used by indian railways.

Changing the angle of the arm gives different indications to the train driver.

They are being replaced with more advanced light signals.

We will build a model of this signal with the help of solenoid.

Solenoid is the generic term for a coil of wire used as an electromagnet.

I will take these two paper straws.

One straw is cut into three pieces.

These two pieces are connected together with cellotape to the main straw.

36 gauge coated copper wire is taken. 700 turns are made around this 6 cm long straw piece.

Both ends are tied together and coating removed with sandpaper.

Empty pen refill is cut and it is fixed to the main straw. We will prepare a signal arm from this small straw with the help of pin. When placed in the refill, it can rotate freely.

Let’s take this eraser. We will make two holes. One for the singal pole and one for the winding.

We will use this long needle. It is tied with thread and another end of thread attached to the signal arm.

This pin will arrest the movement of the arm downwards when the screw is inserted at the other end as counterweight.

Signal in this position indicates STOP for the train.

We will paint this paper strip and attach to the signal arm.

Now let us connect this battery holder to the solenoid. It has 4 AA batteries and can provide a potential difference of 6 volts.

When the circuit is complete, solenoid pulls the needle down as a magnetic field is generated.

The device creates a magnetic field from electric current and uses the magnetic field to create linear motion.

This will be active till current is flowing through the solenoid. Opening the circuit, releases the needle and signal returns back to horizontal STOP position.


Do try this at home.

Thank you.


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The semaphore flag-signaling system is an alphabet-based system that requires waving a pair of hand-held flags in particular patterns. Here's how you send a rescue signal using the flags.

Step 1: Get the receiver's attention
Get the attention of the person you wish to send the signal to by waving both of your flags repeatedly overhead in a scissor-like motion.

Step 2: Wait for acknowledgment
Wait for the receiving party to send the semaphore letter K with their flags. This is the signal to proceed.

Tip
There are unique flag positions for each letter of the alphabet.

Step 3: Transmit N-C
Transmit the letters N-C using your semaphore flags. Move directly from the N position to the C position without stopping.

Tip
In the International Code of Signals the letters N-C stand for "I am in distress and require immediate assistance."

Step 4: Bring your flags down
Bring your flags down in front of you with the flag staffs crossing each other after you have finished.

Step 5: Wait for acknowledgment
Wait for the receiver to send the letter C, acknowledging your distress call. If your message was not received, they will send the letters I-M-I. If this happens, resend your message.

Did You Know?
The International Code of Signals was drafted in 1855 by the British Board of Trade


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