A high-speed direct-writing oscillograph

THE Oscilloscribe, developed in the Servomechanisms Laboratory of the Department of Electrical Engineering, Yale University, is a very high-speed direct-writing oscillograph which produces an immediate permanent record of voltages having frequency components ranging from direct current to 200 cycles per second. Development of this device was started in February 1947 when comparable devices were not available commercially. Since that time several instruments of this general type have appeared on the market and have found a wide variety of applications.1