telephone, the
章节目录
共 19 段- _Messrs. Cecil and Leonard Wray’s Telephone._--This system,
- _Mr. Graham Bell’s Electric Telephone._--Telephonic instrume
- ‘When an intermittent current from a Ruhmkorff’s coil is pas
- The telephone may be heard at the same moment by several lis
- _M. Hellesen’s Reaction Telephone._--M. Hellesen believed th
- _Mr. Phelps’s System._--This system is only deduced from the
- The advantages of induced currents in telephonic transmissio
- I have myself repeated M. des Portes’ experiments by simply
- ‘In the stillness of night I could hear the vibration of the
- I must also mention another arrangement, devised by Captain
- Believing that light and heat can modify the conductivity of
- The slightest shock which affects the microphone has the eff
- I studied these currents for a long time with the galvanomet
- But, besides its use for the purposes of correspondence, the
- As I have already said, seven different messages might theor
- Mr. Edison’s Phonograph, which has for the last year attract
- Fig. 71 represents the tracing which corresponds to the lett
- Although the words pronounced by this machine are distinct,
- [5] This property has long been known, but not applied. In 1