The effective use of transcription machines led to yet another innovation—preaching from house to house with a lightweight phonograph. In 1934 the Society began producing portable phonographs and a series of 78-rpm discs containing 4 1/2-minute Bible lectures. Eventually, recordings covering 92 different subjects were in use. In all, the Society produced more than 47,000 phonographs to trumpet the Kingdom message. However, in time, greater emphasis was laid on oral presentations of the Kingdom message, so the phonograph work was phased out.

Using a phonograph in field service (left)

Demonstrating how to use a vertical-style phonograph, in 1940 (right)