05/12/2017

Who is credited as inventing the telephone?

 Who is credited as inventing the telephone? 
    Was it Alexander Graham Bell, Elisha Gray, or     Antonio Meucci?

   

    Alexander Graham Bell is often credited as the inventor of the telephone since he was awarded the first successful patent. However, there were many other inventors such as Elisha Gray and Antonio Meucci who also developed a talking telegraph.

Attributing the true inventor or inventors to a specific invention can be tricky business. Often credit goes to the inventor of the most practical or best working invention rather than to the original inventor(s). This happens to be the case of the invention of the telephone!
There is a lot of controversy and intrigue surrounding the invention of the telephone. There have been court cases, books, and articles generated about the subject. Of course, Alexander Graham Bell is the father of the telephone. After all it was his design that was first patented, however, he was not the first inventor to come up with the idea of a telephone.
Antonio Meucci, an Italian immigrant, began developing the design of a talking telegraph or telephone in 1849. In 1871, he filed a caveat (an announcement of an invention) for his design of a talking telegraph. Due to hardships, Meucci could not renew his caveat. His role in the invention of the telephone was overlooked until the United States House of Representatives passed a Resolution on June 11, 2002, honoring Meucci's contributions and work. You can read the resolution (107th Congress, H Res 269) onCongress.gov.
To make matters even more interesting some researchers suggest that Elisha Gray, a professor at Oberlin College, applied for a caveat of the telephone on the same day Bell applied for his patent of the telephone- these gentlemen didn’t actually visit the Patent Office, their lawyers did on their behalf. In Historical First Patents: The First United States Patent for Many Everyday Things(Scarecrow Press, 1994), Travis Brown, reports that Bell’s lawyer got to the patent office first. The date was February 14, 1876. He was the fifth entry of that day, while Gray’s lawyer was 39th. Therefore, the U.S. Patent Office awarded Bell with the first patent for a telephone, US Patent Number 174,465 rather than honor Gray's caveat. However, some authors dispute this story and suggest that there was malfeasance by certain individuals at Patent Office, and possibly Bell himself.
If someone asks who is credited with inventing the telephone, you can explain the controversy that still surrounds this question.
Standard DisclaimerRelated Web Sites
  • Alexander Graham Bell's Family Papers From the Library of Congress American Memory Web site, the collection includes "correspondence, scientific notebooks, journals, blueprints, articles, and photographs documenting Bell's invention of the telephone and his involvement in the first telephone company, his family life, his interest in the education of the deaf, and his aeronautical and other scientific research. Dates span from 1862 to 1939, but the bulk of the materials are from 1865 to 1920."
  • Antonio Meucci A short history of Antonio Meucci from the Italian Historical Society of America.
  • Antionio Meucci Revisited This Web page provides details of Antonio Meucci's telephone which includes drawings.
  • Elisha Gray This Web page from the Electronic Oberlin Group, provides a brief history of Elisha Gray along with related Web links for more information.
  • PBS: The Telephone - PBS provides the transcript to the film "The Telephone," a gallery, people & events, and a teacher's guide. The Special Feature section also provides information about forgotten inventions such as the can opener. 

Library of Congress Web SiteFurther Reading
  • Baker, Burton H. The gray matter: the forgotten story of the telephone. St. Joseph, MI, Telepress, 2000. 140 p.
  • Grosvenor, Edwin & Morgan Wesson. Alexander Graham Bell: the life and times of the man who invented the telephone. New York, Harry Abrams, 1997. 304 p.
  • Schiavo, Giovanni Ermenegildo. Antonio Meucci, inventor of the telephone. New York, Vigo Press, c1958. 288 p.
  • Stwerka, Eve & Albert. Hello! Hello! A look inside the telephone. Englewood Cliffs, NJ., Messner, c1991. 40 p. (Juvenile)
  • Hounshell, D.A. Two paths to the telephone. Scientific American, v. 244, January 1981: 156-163.

04/12/2017

The 100 most air polluted cities in the world (PM2.5 μg/m3)




The 100 most air polluted cities in the world (PM2.5 μg/m3)
City
Annual Average
Year
1
Zabol (Iran)
216.7
2012
2
Gwalior (India)
176.1
2012
3
Allahabad (India)
169.7
2012
4
Riyadh (Saudi Arabia)
155.5
2014
5
Al Jubail (Saudi Arabia)
151.7
2014
6
Patna (India)
148.9
2013
7
Raipur (India)
143.7
2012
8
Bamenda (Cameroon)
132.0
2012
9
Xingtai (China)
128.0
2014
10
Baoding (China)
126.0
2014
11
Delhi (India)
122.1
2013.2
12
Ludhiana (India)
121.9
2012
13
Dammam (Saudi Arabia)
120.9
2014
14
Shijiazhuang (China)
120.6
2014
15
Kanpur (India)
114.9
2012
16
Khanna (India)
113.8
2012
17
Firozabad (India)
113.3
2012
18
Lucknow (India)
112.9
2012
19
Handan (China)
111.8
2014
20
Peshawar (Pakistan)
111.0
2010
21
Amritsar (India)
108.1
2012
22
Gobindgarh (India)
107.6
2012
23
Rawalpindi (Pakistan)
107.0
2010
24
Hengshui (China)
106.7
2014
25
Narayangonj (Bangladesh)
105.8
2014
26
Boshehr (Iran)
105.0
2010
27
Agra (India)
104.8
2012
28
Kampala (Uganda)
104.3
2013
29
Tangshan (China)
101.5
2014
30
Jodhpur (India)
101.3
2012
31
Dehradun (India)
100.5
2012
32
Ahmedabad (India)
100.1
2013
33
Jaipur (India)
99.9
2012
34
Howrah (India)
99.6
2012
35
Faridabad (India)
98.2
2012
36
Yenbu (Saudi Arabia)
97.2
2014
37
Langfang (China)
95.5
2014
38
Dhanbad (India)
95.3
2012
39
Chittagong (Bangladesh)
95.1
2014
40
Ahvaz (Iran)
94.9
2010.25
41
Doha (Qatar)
93.4
2012
42
Bhopal (India)
92.6
2012
43
Khurja (India)
89.9
2012
44
Dhaka (Bangladesh)
89.7
2014
45
Kaduna (Nigeria)
89.6
2013
46
Gazipur (Bangladesh)
88.5
2014
47
Karachi (Pakistan)
88.4
2009
48
Cangzhou (China)
88.3
2014
49
Baghdad (Iraq)
87.9
2015
50
Al-Shuwaikh (Kuwait)
87.8
2014
51
Tianjin (China)
87.4
2014
52
Raebareli (India)
87.3
2012
53
Kabul (Afghanistan)
86.0
2009
54
Zhengzhou (China)
85.7
2014
55
Barisal (Bangladesh)
85.3
2014
56
Beijing (China)
85.2
2014
57
Al Wakrah (Qatar)
85.1
2012
58
Kota (India)
83.7
2012
59
Udaipur (India)
83.0
2012
60
Tetovo (FYR Macedonia)
81.5
2013
61
Alwar (India)
81.2
2012
62
Wuhan (China)
79.5
2014
63
Chandrapur (India)
79.4
2012
64
Anyang (China)
79.2
2014
65
Hefei (China)
78.6
2014
66
Pyin Oo Lwin (Myanmar)
77.9
2012
67
Shouguang (China)
77.5
2014
68
Indore (India)
76.4
2012
69
Taungoo (Myanmar)
76.2
2013
70
Greater Cairo (Egypt)
75.6
2013
71
Kyaukphyu (Myanmar)
75.6
2009
72
Jalandhar (India)
75.1
2012
73
Ulaanbaatar (Mongolia)
75.1
2010
74
Akola (India)
74.4
2012
75
Makkah (Saudi Arabia)
74.4
2014
76
Jingzhou (China)
74.3
2014
77
Ali Subah Al-Salem (Kuwait)
74.1
2014
78
Varanasi (India)
73.9
2012
79
Changsha (China)
73.5
2014
80
Noida (India)
72.8
2012
81
Nanjing (China)
72.3
2014
82
Shenyang (China)
71.5
2014
83
Chengdu (China)
71.4
2014
84
Harbin (China)
71.0
2014
85
Namkham (Myanmar)
70.6
2012
86
Delta Region (Egypt)
70.6
2013
87
Kaifeng (China)
70.3
2014
88
Yichang (China)
70.0
2014
89
Yangquan (China)
69.8
2014
90
Pingdingshan (China)
69.8
2014
91
Xiangtan (China)
69.7
2014
92
Jalgaon (India)
69.6
2012
93
Xi'An (China)
69.5
2014
94
Zhuzhou (China)
69.3
2014
95
Meerut (India)
69.1
2012
96
Mawlamyaing (Myanmar)
69.0
2012
97
Laiwu (China)
68.3
2014
98
Al-Mansouriya (Kuwait)
68.3
2014
99
Jiaozuo (China)
68.3
2014
100
Jeddah (Saudi Arabia)
68.0
2014