Paper, 'A contrivance to avoid irregularities in a clock's motion occasioned by the action of heat and cold upon the pendulum' by George Graham Graham, a watchmaker, shares observations on the curiosities in the measuring of time. He notes that the vibrations of a pendulum are slower in summer than in winter, and suggests that this arises from a change of length in the pendulum itself, by the influences of heat and cold upon it, in the different seasons of the year. Subject: Physics / Engineering Published in Philosophical Transactions as 'A contrivance to avoid the irregularities in a clocks motion, occasion'd by the action of heat and cold upon the rod of the pendulum' Read to the Royal Society on 28 April 1726 1726