. Bell telephone magazine . A telephone transmitter, nornudly actuated fjy tlie voice., can aiso be actuated f)y an electric motor. Tfiis mattes it /)ossil)le. as in this picture, to estal)tish definite conditions icliicli are sut)ject to accurate measurement. 65. Jlic chcrkcrpd /xillffti in llic forc^iround rcf/islcrs Ihc (inioiml of molion m thediaplinif/m of a Iclcphoiir receiver its il is pressed loinird Hie pole pieces. 66

---

Size: 1343px × 1861px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922