Our current range of wave investigation equipment:
	Signal Generator & Amplifier      0.1Hz to 100kHz in 6 ranges. Sine, square and triangle wave. Attenuator.  Signal Generator      5Hz to 50kHz in four ranges. Sine and square wave.  Loudspeaker Amplifier Unit      Audio amplifier with voltage gain of 60. Internal loudspeaker.  Loudspeaker      2" diameter. Impedance 8W. Housed in an ABS case.  Microphone      Crystal type. Impedance 1MW. Housed in an ABS case.  Velocity of Sound Switches      Apparatus for experimentally determining the velocity of sound.  Velocity of Sound Kit      A loudspeaker and microphone with instructions.  Thermopile      Used with a suitable voltmeter or galvanometer to detect radiated heat.  Infrared Probe      Used with a suitable voltmeter to detect infrared radiation.  200kHz Pulse Generator      Used to demonstrate pulse propagation methods in cables.