Court and Spark Court and Spark Court and Spark is the sixth studio album by Canadian singer-songwriter Joni Mitchell. It was an immediate commercial and critical success—and remains her most successful album. Released in January 1974, it infuses her folk rock style, which she developed throughout her previous five albums, with jazz inflections. It reached No. 2 in the United States and No. 1 in Canada and eventually received a Double Platinum certification by the RIAA, the highest of Mitchell's career. It also reached the Top 20 in the UK and was voted the best album of the year for 1974 in The
Spark gap voltage across the gap. The heated ionized air rises, carrying the current path with it. As the trail of ionization gets longer, it becomes more and more unstable, finally breaking. The voltage across the electrodes then rises and the spark re-forms at the bottom of the device. This cycle leads to an exotic-looking display of electric white, yellow, blue or purple arcs, which is often seen in films about mad scientists. The device was a staple in schools and science fairs of the 1950s and 1960s, typically constructed out of a Model T spark coil or any other source of