The microphone relay
โ Scribed by Edwin J. Houston; Elihu Thomson
- Publisher
- Elsevier Science
- Year
- 1878
- Tongue
- English
- Weight
- 199 KB
- Volume
- 106
- Category
- Article
- ISSN
- 0016-0032
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
Trouvg has invented a cylindrical microphone, which resembles a small dark-lantern, with a carbon crayon substituted for the candle. When placed in the middle of a room, it reveals all secrets. It transmits the voice admirably to a receiving telephone, even when the speaker stands 25 metres (82 ft.)
Comparative Strength of Wood and Iron.--Heln~ finds that, in most eases, a unifl)vm stren~'th of'struet:ure(~an 1)e more ee()non~ieally ~eeured t)y the use of w.o(I than by the use of iron. The sti-e,gth of w(iod is twol)ortio,w(I t(, ils d(~,~sity, a~,I (';m be in(:rcased by its immersion t'~)r two