In old time via telegram people do communication
typing makes people exchange information or story fast and officially
From Pocket to Smart "watches" has evolved a lot.
Radio : Seen more than 100 years of development.
Compass : A navigational instrument.
Hong Kong Central
Photo of vintage video camera used during world war
Knocker and Intercom in a Roman Entrance
Air conditioner from 1932
TV's helped people see what was happening in their city and in cities around the world.
Buses changed public transportation for the better. They reduced congestion and made moving about the city more affordable.
Evolution of mobile phones.
Florescent paint as street lights
Old and new green technologies
One of the first high rise buildings made possible through frame construction.
Source : http://blog.philadel
Dangerous railroad crossing