Harlie Detector

The Cat’s Whisker is still the best method of receiving wireless signals with purity—but the nerve-racking business of “crystal-tickling” is quite out of date.
The HARLIE-DETECTOR is the modern method. It has the most sensitive crystal yet produced, and also provides a continuous contact that is perfect in every detail. No delicate adjustment is needed—just a turn of the knob. It can be done as easily in the dark as in the light.
Vibration—even hard knocks—cannot disturb the contact, which is always at the exact delicate tension required for perfect reception.
Wireless Weekly (Australia) October 22, 1926, Page 2.

In questo link sono elencati 8 modelli, di cui 6 con immagini e 0 con schemi.
Elenco delle radio e altri apparecchi della Harlie Bros.Ltd., London