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Join this channel to get access to perks: Want to learn more about Periscope Film and get access to exclusive swag? Join us on Patreon. Visit Visit our website “Potted and Printed Circuits” () is a black-and-white film made on behalf of M of S Elliott Brothers and the Telecommunications Research Establishment (TRE), the main UK r&d organization for electronics during and after World War II. The film illuminates the process that was used to develop potted and printed circuit techniques. It was produced by H. Dewhurst, camera by L. Dawson, and directed by E.B. Sudbury. (Note: printed circuit boards (or PCBs) contain an electronic device’s most critical components. PCB potting protects circuit boards by filling a PCB enclosure with a liquid material called a potting compound or encapsulation resin.) The film also shows an early computer, probably the Elliott Brothers' Elliott- Nicholas computer circa 1952. Elliott Brothers merged with English Electric Co. and eventually ICL (International Computers Ltd.) A pulse jet, German V-1 Flying Bomb on a launch rail; montage of components (0:48). Aerial view assembly line at factory for flying bomb (1:08). Small square board featuring 38 components used in a potted circuit (1:52). Female scientist demonstrates steps of jig assembly: connects perspex mounting plates with tubular brass inserts (2:06). Inserts leads after they are cut to right size (2:33). Close-up assembly after multiple leads have been inserted by hand, scientist goes in with bare metal wire to create connections (2:39). Close-up scientist holding finished component assembly (3:00). Young woman prepares casting resin in enclosed glass box, balance scale inside used to weigh the micro loaded polyester resin; other beaker contains mix of catalyst, accelerator, and mica powder (3:03). Beaker placed in glass chamber, air bubbles removed (3:58). Parts of demountable mold used in brick-type assemblies laid out (4:21). C/u mold as scientist pours resin mixture (4:57). Casting removed from mold: step by step instruction of disassembly beginning with positioning pins (5:19). Scientist uses tongs to lower mold into beaker of boiling water then flask of carbon dioxide (5:45). Close-up brick after being exposed to extreme temperatures (6:38). Subminiature valves in split metal holders (6:44). Scientists look over design mock-ups for printed circuits using heated dye stamping process on silver-coated plastics (7:12). Scientist stands at drafting table, creates full-scale drawing of proposed printed circuit (7:34). Scientist carefully cuts pro-film stencil (7:54). Scientist pulls stencil off of surface ground steel block (8:22). Scientist uses tweezers to place steel strips along imprinted design then wipes down block to remove traces of cement (8:53). Close-up finished block, dye ready for use (9:54). Block bolted to heater assembly, mounted into a press (9:58). Close-up plastic card where circuit will be printed (10:09). C/u plastic base with cut geometric pattern from acetate tape (10:21). Plate coated with thermosetting cement, silver powder applied via mesh sieve (10:39). Finished plate positioned in press, dial displays hydraulic pressure (11:17). Plate retrieved (11:47). Components mounted plate (12:13). Scientist prepares soldering device: pours beaker of palm oil, fits assembly into equipment (12:26). Finished unit mounted, forms plug-in unit (13:41). Circuits beside ruler (13:52). M of S Elliot Brothers Computer Lab (London): wires on back of computer, man works on arithmetic circuit at electronic digital computer (14:15). Unit opened revealing cooling glass plates (14:35). Steps for creating glass plate circuit: fits glass plate to pattern with 72 drill holes (15:06). Close-up 9-spindle drilling machine, cutting lubricant floods plate, plate ready for printing (15:25). Another scientist tests plate for continuity in automatic machine (16:24). Plate added to jig, stencil clamped down and jig sprayed (16:54). Final plate with circuit pattern (17:32). Engineer inspects furnace used for processing resistor films (17:39). Engraving machine (17:50). Plate showing finished engraved pattern on typical resistors (18:15). Scientist carefully uses tweezers to add capacitor elements, solders (18:38). Final plates are sealed, operator inspects finished products (19:11). Completed plug-in units showing different types of metal screen (19:34). Engineer, . (Geoffrey) Dummer discusses future of electronic manufacturing, flow diagram of automatic assembly process (19:47). 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
