https://peertube.dngr.us/videos/watch/6ef1230e-29a1-4307-844a-d240d99d34a3 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 Dating to the early 1950s, "Battery Maintenance" is a Bell Telephone training film that explains the importance and operation of lead acid storage batteries in telephone systems. It was produced by Arthur H. Smith and photographed by Gordon Anderson. It covers how these batteries provide power to telephone equipment, especially during power outages, and describes the different types of batteries used. The text also details the components and chemical processes of lead-acid storage batteries, including how they charge and discharge. Additionally, it emphasizes the importance of proper maintenance, safety measures, and regular checks to ensure the batteries function correctly and efficiently. 0:40 - 1:00: Telephone equipment, regardless of location, relies on a battery plant for operation. 1:00 - 1:31: Most telephone equipment is powered by direct current (DC) converted from alternating current (AC) by motor generator sets or rectifiers. In case of AC supply interruption, storage batteries ensure continued operation. 1:31 - 2:00: Storage batteries are crucial for telephone plants, representing significant investment. They provide power during outages until emergency equipment can be activated. 2:00 - 2:23: Different types of storage batteries are used, including older open tank types and newer hard rubber and glass jar types. 2:23 - 3:01: Understanding the maintenance of storage batteries requires knowledge of their parts and operation. 3:01 - 4:08: A storage battery consists of multiple cells, each with positive and negative plates separated by separators and immersed in an electrolyte solution. 4:08 - 5:00: The electrolyte is corrosive. Positive plates are made of lead peroxide, and negative plates are pure lead. The electrolyte's specific gravity indicates the charge level. 5:00 - 6:02: During discharge, the electrolyte becomes lighter as it combines with the plates to form lead sulfate. Recharging reverses this process. 6:02 - 7:16: Voltage varies with charge level. Emergency cells maintain voltage during discharge. Overcharging produces explosive gases. 7:16 - 8:54: Different cell designs include explosion-proof features. Charging routines vary, with continuous float operation being common. 8:54 - 10:03: Accurate float voltage and regular meter checks are essential for maintenance. Protective equipment is necessary for safety. 10:03 - 11:05: Hydrometer readings must be accurate. Voltage readings are crucial for detecting issues. 11:05 - 12:05: Records of readings help identify problems. Boost charges are given when necessary. 12:05 - 13:02: Regular checks and cleanliness are vital. Tightness of battery lugs should be ensured. 13:02 - 14:08: Capacity testers are used if cells don't hold a charge. Low float voltage causes sulfation, reducing capacity. 14:08 - 15:02: High float voltage causes sediment and plate damage. Proper water levels must be maintained. 15:02 - 16:12: Common issues include sulfation, sediment, and cracked plates, which require corrective action. 16:12 - 17:11: Counter EMF cells reduce voltage and prevent damage. They also produce explosive gases. 16:44 Pyrex glass battery containers. 17:11 - 18:26: Key maintenance points include safe operations, correct float voltage, accurate records, preventive boost charges, and cleanliness. 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=tT5oDQ6M68Q Mirrored from Periscope Film (https://www.youtube.com/@PeriscopeFilm) Sat, 13 Jun 2026 13:24:30 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/6ef1230e-29a1-4307-844a-d240d99d34a3 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.