Bell Telephone dial conversion, Ottawa, 13 September 1940
New Dial Unit Is Being Installed In Ottawa Due to the continued growth in the number of telephones in Ottawa, a fourth unit of dial switching apparatus is being placed in operation tomorrow, according to M. B. Hamilton, district manager of the Bell Telephone Company of Canada.- Office No. S, as the fnit is called, is located in the dial centre building at Albert and O'Connor streets, which already houses the other dial offices. "Commencing Saturday, some new telephone subscribers in the dial area in Ottawa will be assigned circuits in office No. 5", Mr. Hamilton explained. "In other words, , these new numbers will begin with '5' for example 5-1551." The new unit will temporarily increase the number of telephone central offices, or "exchanges", in Ottawa to six. In addition to office No. 5, there are three other dial offices Nos. 2, 3 and 4 and two manual exchanges Nos. 7 and 8.