Ninety years ago, the February 1927 issue of Popular Mechanics showed how to put together this simple but effective crystal set.

The cost of the parts (not including the headphones) was less than a dollar. The set was particularly recommended for boy builders, but as shown in this picture of grandmother enjoying a listen, the grown ups would also enjoy it.

The spiderweb style coil was wound on a cardboard form, and included a slider on one of the spokes for tuning. The crystal holder was mounted on top, and the wiring was neatly recessed into the wooden base, which called for a coat of mahogany or walnut stain. For best results, a 75-80 foot outdoor antenna was recommended, with a good ground to a cold water pipe. The set was said to provide good volume on local stations, with good selectivity.