Powered by two 1.5-V “D” cell batteries, this timer can be clamped down anywhere in the laboratory. The 13 mm wide paper is guided over a striking surface at a rate between 30 to 50 marks per second. The rate can be slowed by inserting an aluminum rod (included) in place of one battery. Carbon discs and a roll of paper included.
Additional ResourcesNo Additional Resources at the time.
Flinn Catalog/Reference Manual Page 641