• Support PF! Buy your school textbooks, materials and every day products Here!

The Principles of Magnetism

  • #1
Hi, I have a research question focusing on the historical development of the telephone. However, I have to write it with emphasis it's dependence principles of magnetism. So far, I have not found anything to relate the two topics. I also must include

1. a reference to at least one person who contributed to the development of the telephone

2. a description of the general scientific principles upon which the operation of the telephone designed by the person in number 1, is based.

3. a direct description of how the person in question 1 used the principles related to magnetic fields in their design.

So far, I have only found either one topic, or the other. I have no idea where to look for a person who used this principle to develop the telephone. Could someone help me out? Thanks.
 

Answers and Replies

  • #2
555
0
I found the following on Wikipedia (article about Telephone):

14 February 1876 — Alexander Bell applies for the patent "Improvements in Telegraphy", for electromagnetic telephones using undulating currents.
30 January 1877 — Bell's U.S. patent 186,787 is granted for an electromagnetic telephone using permanent magnets, iron diaphragms, and a call bell.
 
  • #3
199
0
So far, I have not found anything to relate the two topics.
There is so much documentation out there about this primarily because of the telephones importance.
Magnetism plays a critical role in the telephone, try wikipedia for invention of telephone.
 
  • #4
But isn't wikepedia not a valid source of information? Seeing as how other people write the articles, which could contain false information.
 
  • #5
199
0
Thats a fair point to make but out of my own personal experience I have never come across anything wrong on wikipedia. Even though everyone can edit it, it still has standards, if mistakes are made they will be corrected.
 
  • #6
555
0
Even if Wikipedia can sometimes state mistakes, you can still use it to look up information. If you need exact, detailed information about a certain subject (like the invention of the telephone) there are probably better sources available, which you might also be able to find through Wikipedia.
 

Related Threads for: The Principles of Magnetism

Replies
2
Views
549
Replies
7
Views
2K
  • Last Post
Replies
2
Views
713
Replies
7
Views
16K
  • Last Post
Replies
1
Views
738
Replies
2
Views
951
  • Last Post
Replies
1
Views
1K
Replies
2
Views
589
Top