Saw this item on the local Craigs List. Thought it was interesting and a few others might too...
=== EATON Vickers Adjustable Speed Hydraulic Drive Model TR3-HR18 F 18-20
This is a great unit for controlling the speed of any number of shop tools: lathe, drill press, mill, band saw
Power source: Constant speed input supplied by up to 1 hp electric motor at 1150 to 1800 rpm. Input power must be 1/4hp more than required output power.
Load: a maximum of 3/4hp & 40 in-lbs of torque is possible. Output speed is fully adjustable from 100rpm to input rpm (1800) by hand-wheel control & is completely reversible with respect to the input rotation. The speed % is displayed by a dial as 0, 25, 50, 75, & 100 in either direction. The unit also has a control shaft for providing quick speed change by use of an attached lever or servo controller. Only +,- 20 degrees of lever motion is needed. Control hand-wheel may be mounted on other side of unit.
Description: This is a new unit & original container of hydraulic fluid is provided. Comes with original User's manual & overhaul manual. Input & output shafts are 1/2" diameter & keyed, & are in-line. This unit is built like a tank!
Over-all Dimensions: 13"W x 8"D x 6"H (about the size of a fhp electric motor) Mount: 4-bolt (1/4" holes) pattern, 8 1/2" x 3 3/4" Weight: 23#