Homemade Jar Opener

The accompanying sketch shows a handy device for turning up and unscrewing the covers on glass fruit jars. The loop is slipped over the cover and the handle turned in the direction of the arrow. To unscrew the cover, the tool is turned over and the handle turned in the opposite direction.
Homemade Jar Opener
The Loop in the Leather Grips the Cap Tightly When the Handle is Turned as the Arrow Indicates

The loop should be just large enough to slip over the cover easily. It is made of leather and fastened to the wood handle with screws.

—Contributed by J. B. Downer, Seattle, Wash.

Excerpt from the book:
THE BOY MECHANIC – BOOK 2 1000 THINGS FOR BOYS TO DO
HOW TO CONSTRUCT DEVICES FOR WINTER SPORTS, MOTION-PICTURE CAMERA, INDOOR GAMES, REED FURNITURE, ELECTRICAL NOVELTIES, BOATS, FISHING RODS, CAMPS AND CAMP APPLIANCES, KITES AND GLIDERS, PUSHMOBILES, ROLLER COASTER, FERRIS WHEEL AND HUNDREDS OF OTHER THINGS WHICH DELIGHT EVERY BOY WITH 995 ILLUSTRATIONS PUBLISHED 1915, BY H. H. WINDSOR CHICAGO POPULAR MECHANICS CO. PUBLISHERS