Pendulum the pendulum could be used to measure the force of gravity. During his expedition to Cayenne, French Guiana in 1671, Jean Richer found that a pendulum clock was minutes per day slower at Cayenne than at Paris. From this he deduced that the force of gravity was lower at Cayenne. In 1687, Isaac Newton in "Principia Mathematica" showed that this was because the Earth was not a true sphere but slightly oblate (flattened at the poles) from the effect of centrifugal force due to its rotation, causing gravity to increase with latitude. Portable pendulums began to be taken on voyages
Which? the creation of the Scottish parliament in 1999, in January 2002 Which? established an office in Edinburgh. Which? also works with the European Consumers' Association (BEUC) which brings together over forty consumer organisations from across Europe to represent common consumer interests within the EU institutions. The Consumers' Association has the power under The Enterprise Act 2002 to take action on behalf of consumers, including the ability to bring a super-complaint to the Office of Fair Trading (OFT). Which? is one of eight organisations able to issue a super-complaint. The Consumers' Association was among the first groups granted these new powers.