PHDV 309 GLOBAL COMMUNICATION

In ancient times, people used this medium to convey simple messages over long distances. These were primitive but effective methods for their time.

• telegraph wires
• telephone

• smoke signals
• carrier pigeons

In the late 18th century, used semaphore lines and towers were developed, allowing for the transmission of coded messages over hundreds of miles.

• Semaphore lines and towers
• Smoke signals
• Carrier pigeons
• Telegraph wires and poles

In the 1830s and 1840s, the invention of Samuel Morse and others enabled the rapid transmission of messages over wires, revolutionizing long-distance communication.

• INTERNET

• SEMAPHORE

• PIGEONS

• ELECTRICAL TELEGRAPH

In 1876, Alexander Graham Bell patented an invention, which allowed for the transmission of voice over electrical wires. This paved the way for long-distance voice communication.

• telephone

• computer

• cellular towers

• tablets

The advent of cellular networks and mobile devices in the late 20th century made long-distance communication more accessible and portable.

• internet communication

• mobile communication

• telegraph

• morese code