Sewred,
The White Rotary uses a standard 15x1 needles, can be found at JoAnn's, etc...I use Schmetz needles in mine.
I have a 1917 White Rotary FR, it had been converted to electric in the past. My friend gave me the machine, it was her friend's. It was a family machine and had always been kept inside the house.
I found a cabinet locally and did a motorectomy and she's a treadle again. All I had to do to it was oil it and remove the old compacted lint in the feed dog and bobbin area, sews beautifully.
Her name is Susie after her former owner.
Sharon