Recent advances in N.Z. post office telephone exchange air conditioning techniques
RI Osborne · New Zealand Engineering · 1957
New exchanges are continually being erected to meet the growing demand for telephone service. Each new telephone exchange, while conforming to a general pattern, has its own distinctive features and, consequently, presents its own peculiar problems in air conditioning. The basic principles on which these problems are solved in the N.Z. Post and Telegraph Department will be dealt with in this paper.