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 Witch of 142 times in concert version in the following countries: Norway, Canada, USA, the Netherlands, England, Spain, Finland, Sweden and Denmark. The total attendance figure is approx. 276,000. Total record sales are in excess of 110,000 units. Licensed productions have been staged in several European countries. Which Witch Which Witch is a musical written by Norwegian singers/composers Benedicte Adrian and Ingrid Bjørnov. The storyline for "Which Witch" was derived from the witch finder's manual "Malleus Maleficarum", and the original script was written by Adrian and Bjørnov's manager Ole A. Sørli. The lyrics of the early concert versions were written by