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Telegraph:

Telegraph was made in 1830s by Samuel Morse. A student of Chandranagar Banga Vidyalaya from West Bengal explained the working of telegraph at Jawaharlal Nehru National Science Mathematics and Environment Exhibition for Children. To know how telegraphs works, watch this video.

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Metadata
Learning Outcome	knows how telegraphs works
Time Required	0:08:56
Interactivity Type	expositive
Reading Level	not set
Curricular	true
Educational Subject	science
Educational Alignment	all
Based on Url	not set
Source	ciet, ncert
Copyright	cc-by-sa 4.0 unported
Educational Level	secondary, senior secondary,
Educational Use	videos
Text Complexity	not set
Target Audience	teachers, students,

License:[Source CIET, NCERT ]Aug. 11, 2020, 9:33 p.m.

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