south cambridgeshire (uk) based explorer - i post stuff i think is ok. sometimes i create summaries of others stuff. now & then I'll create content when inspired. it keeps me amused.
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Where the stuff on this blog is something i created it is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License so there are no requirements to attribute - but if you want to mention me as the source that would be nice :¬)
Wednesday, 20 June 2012
we learn about the telephone (1965)
via brainpickings
what did people do before the telephone?
by sending runners with messages
then they discovered they could ride horses
smoke messages, flashing mirrors, blinking lights at night
then the telegraph
then the telephone - how does that work
- sounds make sound waves that vibrate through the air
- when they reach the ear of another the ear drum moves back and forth
- speaking into the phone - the sound waves go into the telephone which make the electrical current alter - which is then sent down the wire to vibrate the receiving plate at the receiving end
then some telephone etiquette and advice
- don't shout use you normal voice
- using the dialing mechanism properly
- don't wait too long to answer
- and let it ring 8 to 10 times
- speak clearly
- don't hog the phone
- using the telephone book
- and having your own one for numbers you use frequently
- how to call the police in an emergency
humans are also working with satellites sending messages
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