Superconducting magnet issues "shaken" out of them, until they are eventually able to operate reliably at their full planned current without experiencing quenches. Although the idea of making electromagnets with superconducting wire was proposed by Heike Kamerlingh Onnes shortly after he discovered superconductivity in 1911, a practical superconducting electromagnet had to await the discovery of superconducting materials that could support large critical supercurrent densities in high magnetic fields. The first successful superconducting magnet was built by G.B. Yntema in 1955 using niobium wire and achieved a field of 0.7 T at 4.2 K. Then, in 1961, J.E. Kunzler, E. Buehler, F.S.L. Hsu,
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