This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
Carrying a milk bottle by the rim is tiresome work for the fingers, so I constructed a handle, as shown in the sketch, from a piece of wire. The carrier can be easily placed in the pocket.
The part fitting under the rim of the bottle neck is bent to form two semicircles, one hooking permanently at A, while the other is hooked at B after it is sprung around the neck of the bottle. - Contributed by Lawrence B. Robbins, Harwich, Mass.
Ill: A Carrier Made of Wire to Quickly Attach on a Milk - Bottle Neck