CONTENTS.

A new Geometrical Method' of confruclingSun-Dials, - . - Page 95

A Description of the Hungarian Machinefor raising Water from Mines , - 102

Description of a Bump , invented by M. De-la-Hire, which raises Water equally quickby the Descent as by the Ascent of theBison in the Bump-B artel, - 109

The Height of the apparent Level abovethe true, at different Distances from theLevelling Instruments - - 115

Of the Velocities acquired by falling Bodies ,and the Spaces they fall through in dif-ferent Times, - - - 117

A Table shewing how much the Mercurywould fink in a Barometer at givenHeights above the Earth's plane Surface ;and consequently , how the Heights of Hillsmay be found thereby , - - 121

To divide the Area of a given Circle' intoany required Number of equal Tarts, byconcentric Circles , by Mr. Hutton, 123

To make two equal Circles, whose Areas ,taken together , shall be equal to the AreaAs of