White Taffy Candy, page 248.

Two cups of sugar, 1/2 a cup of water and 1 table-spoonful of vinegar; boil until it will harden in cold water, pour on buttered plates and pull as soon as it is cool. It is better not to cook more than double this amount as a time.

Mt. Vernon Cook Book, Second Edition, 1908, Thompson Company Printers, Carthage, Mo.