Abstract: Slot-array antennas are connected by waveguides (14, 15, 16, 17) to microwave generators and are disposed within a vacuum drying tank of a drying apparatus. Blocking plates (23) are mounted in the waveguides so as to keep the waveguides airtight thereby maintaining an atmospheric pressure within the waveguide portions near the microwave generator during operation of the apparatus. The slot-array antennas (19, 20, 21, 22) have heat pipes (27) attached to the sides of said antennas so that a heat radiation may be effected simultaneously with the microwave heating.

Abstract: A lamp body is internally provided with an electromagnet and an electric circuit for exciting the electromagnet intermittently at given time intervals. A movable member having a wick type bulb mounted above the electromagnet is supported by means of a relatively weak spring, the movable member being provided with a magnetic piece attracted by the electromagnet. When the electromagnet is intermittently excited by the electric circuit, the movable member provided with the wick type bulb may be attracted and released whereby the wick type bulb moves and appear to flare.