The L1 coil consists of 20 to 100 turns of fine wire in a cardboard box where plant specimens are placed for study. The applied pulsating magnetic field serves to verify its influence on the growth of these plants, in the various tropisms and in other experiments. The circuit can be powered by a source as it must be continuously connected. The pulses can be faster with the change in C1. The circuit is from a book by Newton C. Braga.
