WATER RISING ABOVE ITS LEVEL.
Take two panes of common window-glass, about six inches square, set them together at one side, and at the other side prevent them exactly joining by a little wax, so that the two planes form a very small angle, as one or two degrees. Then place the bottom edge about an inch down into a dish of water, when the water will rise between the panes in the form of a hyperbola.
