Recipe Booklet, "Jell-O Secrets for the Automatic Refrigerator," 1929

By the late 1920s, electric refrigerators became more prevalent in homes as technology improved, affordability increased, and people had greater access to electric power. Homemakers enjoyed the reliability, efficiency, and convenience of refrigerators -- a welcome alternative to iceboxes. This Jell-O booklet features recipes for use in automatic refrigerators, noting that they aid in quick preparation and more complete chilling for frozen treats.