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
Delft University of Technology Hanjalić, and the first Dutch prime minister of the Netherlands after World War II Wim Schermerhorn. Two TU Delft alumni were awarded Nobel Prize and one recipient has been affiliated with TU Delft: Jacobus van 't Hoff was awarded first Nobel Prize in Chemistry in 1901 for his work with solutions. Simon van der Meer was awarded Nobel Prize in physics in 1984 for his work on stochastic cooling and one has been affiliated with TU Delft, Heike Kamerlingh Onnes in 1913 for studies related to liquefaction of helium in the quest for the lowest temperature on Earth. Some of