[N317165], Technical Note, Thomas Alva Edison, April 16th, 1886
https://edisondigital.rutgers.edu/document/N317165
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Title
[N317165], Technical Note, Thomas Alva Edison, April 16th, 1886
Editor's Notes
p. 165 "Air Telegh-- Barometer at Geneva being 27.08 on top Mt Blanc 15732 feet above sea was 16.08 correct Geneva by Sea Level. Then experiment on long vacuum tubes for conducting vibrations from 7 ohm phonoplex coil to telephone at different pressures use regular Hg Guage as McLeod not required--" p. 167 "On Top Mt Blanc difficult to make yourself heard The Barom16.08, hence the compressed air for Deaf device & in long speaking Tubes is ok-- Try alchohol or other liquid instead compressed air in fish bladder--" p. 169 "Important put man on this & work up system of Iron underground telephone-- No Electricity-- In water a bell is heard 45000 feet which in air can only be heard 656 feet. Velof sound in Water 4950 per sec Iron 17,500 (drawing) Iron wire suspended by strings in a box in the earth only transmit the sound Molecul only not move the whole wire-- also just bury in earth & see how far can Transmit-- Try dif forms of tranmitter & receiver
Author
Date
1886-04-16
Type
Folder/Volume ID
N317-F
Microfilm ID
43:85
Document ID
N317165
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University