The wig-wag [an instrument measuring solar radiation] utilizes the principle that the gaseous phase of a volatile liquid expands as a result of the conversion of radiant energy to sensible heat. It requires only a reading of the count at whatever interval the observer chooses.
Source: wiktionary
The most common failure on the older models [of washing machines] was a $12 part called a "wig-wag" – that's right, a "wig-wag" – it was a simple part that kept the washer washing and could be replaced in five minutes or less.
Source: wiktionary
Framed by the pulsing wig-wag lights the painted the stone walls and arched windows of the front of the Gallatin Gateway Inn in vivid reds and blues, Cody Hoyt tossed the duffel he'd saved into the back of his Ford.
Source: wiktionary
I parked near a big sound stage building; lamped a red wig-wag signal rocking back and forth to indicate a scene being shot inside. This meant no admittance until the cameras had stopped grinding. Presently a bell jingled and the wig-wag died.
Source: wiktionary
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