← The Boy Mechanic, Book 2: 1000 Things for Boys to Do, Volume 4
Chapter 106
Cooler for Milk and Butter
An earthen jar or crock, with a cover, set in a box containing moist sand will keep butter and milk in hot weather better than a refrigerator. The sand must be kept moist at all times.—Edwin J. Bachman, Jr., Fullerton, Pa.