https://peertube.dngr.us/videos/watch/989d1a7f-f0cb-4144-9620-d047dc721c24 Join this channel to get access to perks: https://www.youtube.com/channel/UCddem5RlB3bQe99wyY49g0g/join Want to learn more about Periscope Film and get access to exclusive swag? Join us on Patreon. Visit https://www.patreon.com/PeriscopeFilm Visit our website www.PeriscopeFilm.com Part 2: https://youtu.be/AGr7d9BDcAk Created by Audio Productions for Bell Telephone to train employees, "Telephone Relays Wire Spring Type" dates to the early 1950s. The film describes the development and features of the wire spring relay, a crucial component in telephone switching systems. It explains the challenges faced by engineers at Bell Laboratories in designing a relay that is more sensitive, faster, cost-effective, and durable compared to its predecessors. The text details the unique features of the wire spring relay, such as its simplified design, reduced maintenance needs, and improved performance. It also highlights the testing process and the advantages of the wire spring relay, including reduced magnetic interference, faster operation, and better reliability. 0:44-0:58: The parade of relays traces back to the early telephone switching systems, which have evolved to support modern high-speed communications. Relays are crucial to these systems. 1:01-1:07: Introduction of the latest wire spring relay. 1:10-1:17: Bell Laboratories engineers face various challenges, including designing relays with improved sensitivity, speed, and cost-efficiency. 2:00-2:06: The wire spring relay was developed to meet these objectives, offering significant savings and improved performance. 2:19-2:23: Initial designs were modified, leading to the current wire spring relay. 3:04-3:07: Different types of relays (AF, AG, AJ) were developed for various purposes. 3:18-3:26: Unique features of the wire spring relay include wire springs for contacts and a simplified design with fewer parts. 4:03-4:09: Adjustments in wire spring relays are minimal compared to older models. 5:08-5:16: The core plate allows mass adjustment of contacts, reducing costs. 6:01-6:07: The large core and pole face area increase magnetic flux, enhancing sensitivity and reducing interference. 7:05-7:17: Comparison of rebound in UR and wire spring relays shows reduced rebound in the latter. 8:02-8:12: The fixed spring assembly is made of heavy wires with molded guide slots for movable contacts. 9:01-9:07: Small contact blocks are made of inexpensive metal with a thin layer of precious metal. 10:02-10:09: Movable contact springs are arranged in pairs, with each pair associated with a single fixed contact. 11:03-11:22: Wire assemblies are molded into continuous strips and cut to length. 12:05-12:16: Contacts are welded onto the wires using a thin layer of precious metal. 13:00-13:08: The wire spring relay's design eliminates sliding surfaces, improving adjustment life. 14:00-14:09: The punched fiber card supports the armature and balancing spring, reducing spring vibration. 15:01-15:14: The pre-tension in twin wires holds movable contacts against fixed contacts. 16:01-16:08: Reduced spring vibration in wire spring relays leads to less contact erosion and more reliable operation. 17:01-17:08: Various contact arrangements are possible with different card designs. 19:02-19:16: Armature travel is determined by the core plate, eliminating the need for adjustment. 20:05-20:16: Wire spring relays are tested for a billion operations, demonstrating their durability. 21:01-21:04: Magnetic interference is minimized in wire spring relays, allowing more compact equipment arrangement. 22:03-22:18: Wire spring relays operate faster than UR relays, reducing the need for common control equipment. 23:19-23:27: The transparent plastic dust cover protects contacts and springs from injury. 24:01-24:25: Overall, wire spring relays simplify circuit engineering, reduce maintenance, and improve service quality. Motion picture films don't last forever; many have already been lost or destroyed. For almost two decades, we've worked to collect, scan and preserve the world as it was captured on 35mm, 16mm and 8mm movies -- including home movies, industrial films, and other non-fiction. If you have endangered films you'd like to have scanned, or wish to donate celluloid to Periscope Film so that we can share them with the world, we'd love to hear from you. Contact us via the weblink below. This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD, 2k and 4k. For more information visit http://www.PeriscopeFilm.com Source: https://www.youtube.com/watch?v=42XAQXOoZjI Mirrored from Periscope Film (https://www.youtube.com/@PeriscopeFilm) Sat, 13 Jun 2026 13:29:00 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://peertube.dngr.us https://peertube.dngr.us/lazy-static/avatars/41a6fee9-7f57-42d0-a5fc-5db4f1af2e31.png https://peertube.dngr.us/videos/watch/989d1a7f-f0cb-4144-9620-d047dc721c24 All rights reserved, unless otherwise specified in the terms specified at https://peertube.dngr.us/about and potential licenses granted by each content's rightholder.