![Bell telephone magazine . development of the tele-phone relay goes forward: contactmaterials and shapes, elimination ofchatter, protection from dust and dirt,improved magnetic structures, betterwindings—all are being studied bythe Laboratories in the Bell telephone magazine . development of the tele-phone relay goes forward: contactmaterials and shapes, elimination ofchatter, protection from dust and dirt,improved magnetic structures, betterwindings—all are being studied bythe Laboratories in the](https://c8.alamy.com/comp/2CRXET3/bell-telephone-magazine-development-of-the-tele-phone-relay-goes-forward-contactmaterials-and-shapes-elimination-ofchatter-protection-from-dust-and-dirtimproved-magnetic-structures-betterwindingsall-are-being-studied-bythe-laboratories-in-the-constant-effortto-provide-more-efficient-and-trouble-free-telephone-apparatus-the-telephone-receiver-in-bells-original-telephone-thesound-waves-of-the-voice-caused-apiece-of-magnetic-material-to-vibratein-the-field-of-an-electromagnet-andthus-to-generate-in-the-coil-of-themagnet-a-varying-current-at-the-re-ceiving-end-of-the-circuit-this-cu-2CRXET3.jpg)
Bell telephone magazine . development of the tele-phone relay goes forward: contactmaterials and shapes, elimination ofchatter, protection from dust and dirt,improved magnetic structures, betterwindings—all are being studied bythe Laboratories in the
![This Telephone bell ringer circuit for generating the electricity bell in the old telephone. it is relatively loud,can use t… | Circuit, Telephone, Circuit projects This Telephone bell ringer circuit for generating the electricity bell in the old telephone. it is relatively loud,can use t… | Circuit, Telephone, Circuit projects](https://i.pinimg.com/736x/b2/3d/1d/b23d1d67779c5ed77fe3c204df352ac5.jpg)
This Telephone bell ringer circuit for generating the electricity bell in the old telephone. it is relatively loud,can use t… | Circuit, Telephone, Circuit projects
![Simple Telephone Ring Amplifier circuits | ElecCircuit.com | Circuit projects, Sound frequencies, Circuit Simple Telephone Ring Amplifier circuits | ElecCircuit.com | Circuit projects, Sound frequencies, Circuit](https://i.pinimg.com/474x/b7/a4/85/b7a48576e888b627ee11ef70867d76ac.jpg)