- Circa 1800's
- Dimensions between posts: 2-3/4" L-R x 2-3/4" F-B
- Base: 8" x 5-1/2" x 3"
- Bottom Platen: 3" diameter
- Overall dimensions: 17.5"(l) x 5/9"(w) x 14.125"(h)
- Lever operated up acting hydraulic cylinder
An exceptionally well preserved EARLY PHILOSOPHICAL INSTRUMENT by W.S. Ritchie & Sons, Boston, MA. This device, which was used for demonstrating the principles of hydraulics first discovered some seventy years before, is fitted and finished in the best Nineteenth Century fashion with true "acorn" finials on the columns. Nearly all of the green and gold paint remains on the cast iron body. The device is identical to one illustrated in an early publication of the Smithsonian Institute, a copy of the relevant sections of which is included with this tool.