An interesting set designed to minimize the operations necessary in tuning is the Jeweler's Time Receiving Set of the Chicago Radio Laboratory, shown below. In the construction of the set the idea of the designer was to so simplify things that an operator with no previous knowledge whatever of tuning could not help but get the results he desired. The audion is built in with the tuner, and the set is regenerative.
With the detector in order, there are just two adjustments. All the jeweler has to do is to turn the knob marked "Tuning" until he gets the signals, and then amplify the signals by rotating the other knob marked "Regeneration". The set is ideal for the jeweler to whom receipt of time signals is a matter of business and who cannot spare the time to learn the operation of a more complicated set.