[N317165], Technical Note, Thomas Alva Edison, April 16th, 1886

Item

Abstract

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

Date

1886-04-16

Decade

1880-1889

Identifier

N317165

Folder Set

N317

Title

[N317165], Technical Note, Thomas Alva Edison, April 16th, 1886

Microfilm ID

43:85

Publisher

Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University