Tracts on weights, measures, and coins : Viz. I. Synopsis of a system of equalization of weights and measures of Great Britain. II. A comparison of various pendulums, and reasons for preferring that which is proposed in the synopsis. III. Observations on the equalization of coins. IV. A new method of finding pretty accurately the center of oscillation in a pendulum. V. Remarks on Mr Whitehurst's method of obtaining invariable measures. VI. Remarks on Dr Rotheram's observations on the proposed plan for equalizing all our weights and measures. By George Skene Keith, M.A. minister of Keith-Hall and Kinkell, Aberdeenshire.