Superconductivity and carbon nanotubes, are Type I, while almost all impure and compound superconductors are Type II. Conversely, a spinning superconductor generates a magnetic field, precisely aligned with the spin axis. The effect, the London moment, was put to good use in Gravity Probe B. This experiment measured the magnetic fields of four superconducting gyroscopes to determine their spin axes. This was critical to the experiment since it is one of the few ways to accurately determine the spin axis of an otherwise featureless sphere. Superconductivity was discovered on April 8, 1911 by Heike Kamerlingh Onnes, who was studying the resistance
What Katy Did as Dorry, Bryn McAuley as Joanna, and Dean Stockwell as "Tramp". A 1972 UK movie adaptation, "Katy", starred Clare Walker, and the 1962 eight-part TV series made in the UK, also called "Katy", featured rising star Susan Hampshire in the title role. In 2015, author Jacqueline Wilson wrote her novel "Katy", which is a modern retelling of "What Katy Did". The August 2016 edition of Storytime featured a new illustrated adaptation with illustrations by Italian artist Marco Guadalupi. "What Katy Did" was followed by four sequels: "What Katy Did at School" in which Katy and Clover attend the fictional Hillsover