Posted 8 months ago
Robbins & Myers was one of the early big 4 manufacturers of electric fans. The other three were Westinghouse, General Electric and Emerson.
This fan was made in the 1920s by Robbins & Myers. The 3500 series started in 1920. This model is the 3504. The exciting change of which I know is the oil reservoir in the lower center in photo #3.
Other fans from this period had brass blades but this had steel blades with copper primer painted black. The brass age was starting to wane and is pretty much done by 1930.
The exciting feature of this fan is that it has a selector switch for AC and DC which is also the on/off switch. In the early days of electricity there had not been an agreement of AC or DC. New York City was still on DC until the 1930s.
Please note this is not an industrial fan. There is a myth that the open cage fans were for industrial use and it is just not true. These fans were designed for use in a home or office.