Electricity-82 (original) (raw)
E-82
Electromagnetic Radiation
(See R. M. Sutton "DEMONSTRATION EXPERIMENTS IN PHYSICS" p.455)
DEMONSTRATION SHORT-WAVE APPARATUS
The characteristics of high-frequency radiation in the one-meter wavelength range can be shown with this apparatus. It consists of the four elements listed below. with complete instructions.
The oscillator produces a continuous wave of about 135-cm wavelength (222 megahertz). adjustable over a range of about 10 cm. It operates on 115 volts A.C., 50/60 Hz.
The transmitting antenna consists of two rods about 70 cm long supported in two binding posts on the housing.
The receiving antenna consists of two rods of the same length mounted end-to-end and holding a small incandescent flashlight lamp which the transmitter can light several meters away.
The Lecher-wire system consists of two horizontal parallel wires several meters long and a sliding carriage holding an incandescent bulb.
WAVEMETER
A variable condenser in series with an inductance loop and an incandescent lamp. When tuned to resonance with the Short-Wave Apparatus the lamp will light. Can be calibrated using the Lecher-wire system. A 6.2-volt and a 2.2-volt bulb are included for preliminary and sensitive tuning.