Wavelength Permanent Detector
Taken from the enclosed leaflet: This Detector has been evolved after very careful research and exhaustive tests. It will be found thoroughly efficient, and if carefully treated should give indefinite service.
Those Crystal-set users who already have the usual Cup and Catswhisker fitment on their sets need not dismantle same, the “Wavelength” Detector being quite easily added to the set.
When Detector is in use, Catswhisker must not be in contact with Crystal, or vice-versa.
For method of attaching to set in place of Crystal the same method as when fitting up a Crystal Cup should be followed.
For method of attaching to Set in conjunction with existing Crystal and Catswhisker, see sketch
In the event of fading taking place, it is possible, by turning small handle on the Detector to revive same. Every “Wavelength” Detector is carefully tested before packing, but it is possible that in transit it may become temporarily out of action. If in fitting same to the Set the results are poor, turn handle slowly until results come through satisfactorily.
Every Detector is tested and guaranteed before packing.