A cardboard-based, 23 cm by 10 cm long, slide rule giving the properties of rigid radiofrequency (rf) waveguides of various sizes and materials as a function of frequency. The double-sided slide rule covers the frequency range from 0.32 to 325 GHz and was used by personnel in the Accelerator Physics Branch at Chalk River to determine the optimum waveguides to be used to guide rf power from the transmitters (power sources) to the rf accelerating structures. This artifact was developed and supplied by Microwave Development Labs. Inc of Natick, Mass., who were a leading manufacturer of waveguides.
