Fizeau–Foucault apparatus unit. At the time, Foucault was working at the Paris Observatory under Urbain le Verrier. It was le Verrier's belief, based on extensive celestial mechanics calculations, that the consensus value for the speed of light was perhaps 4% too high. Technical limitations prevented Foucault from separating mirrors R and M by more than about 20 meters. Despite this limited path length, Foucault was able to measure the displacement of the slit image (less than 1 mm) with considerable accuracy. In addition, unlike the case with Fizeau's experiment (which required gauging the rotation rate of an adjustable-speed toothed wheel), he could
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