4 RPM Dayton Industrial Motor, Model 3M326/3M326A
This motor is a NEW IN BOX Single Phase, 115 VAC, 60Hz, 1/40 HP Shaded Pole Motor, Continuous Duty, Insulation Class B, 200 in-lb torque, face or base mount, 5/8 inch output shaft with ball/needle bearings, and still in the heavy shrink wrap in the orignial container. It is an excellent buy at $75 having cost $170 from Grainger's. Perfect for that observatory you may be trying to build. I have one for mine, but had to take two others in the deal. Help us both out and get one of these for your project. Can't get much simpler than 115V and a 5/8" shaft at 4 rpm.
Call me if you have any questions.