Description: A
high frequency vacuum tube oscillator has its dipole radiator antennae removed
and the one turn inductive coil of the oscillator is mutually coupled to a turn
of copper wire which feeds two parallel wires stretched across the lecture room.
Standing waves are developed on the parallel wires by varying the lengths of the
wires to obtain optimum tuning with the oscillator. An incandescent or neon lamp
connected to a set of metal stubs which can be slid along the parallel wires serves
as the detector. At intervals of half the wavelength, the bulb will light. It
will be dark at other points.
Materials: high
frequency oscillator, two parallel wires (about 20 feet long), a turn of copper
wire, power source, testing lamp (mounted on parallel wires with metal stubs),
supports