DVD1975 20 Minutes
How problems of excessive noise and be tackled.
The film looks at several actual cases of machines with a high noise level where modification of design can, and has effectively reduced noise. The principle of analysing, defining and isolating the source is illustrated. Cases shown include a fire engine cab, where noise levels were so high that the radio telephone could not be heard, and a saw where design modification has halved the original noise level. See under "Air Pollution" for three more films.
NB Archive material 40 years old.