The air of an automatic telephone exchange must be kept at a certain temperature and must not contain too much moisture. Here is the refrigerating plant of the Mount Eden exchange. It chills the air which is later heated before entering the operating room.
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https://paperspast.natlib.govt.nz/newspapers/SUNAK19281208.2.163.7
Bibliographic details
Sun (Auckland), Volume II, Issue 532, 8 December 1928, Page 17
Word Count
44The air of an automatic telephone exchange must be kept at a certain temperature and must not contain too much moisture. Here is the refrigerating plant of the Mount Eden exchange. It chills the air which is later heated before entering the operating room. Sun (Auckland), Volume II, Issue 532, 8 December 1928, Page 17
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