Canning fruit baked in oven

Canning fruit recipe
In this method the work is easily and quickly done and the fruit retains its shape, color and flavor. Particularly nice for berries.
Sterilize jars and utensils. Make the syrup; prepare the fruit the same as for cooking. Fill the hot jars with the fruit, drained, and pour in enough hot syrup to fill the jar solidly. Run the handle of a silver spoon around the inside of the jar. Place the hot jars, uncovered, and the covers, in a moderate oven.
Cover the bottom of the oven with a sheet of asbestos, the kind plumbers employ in covering pipes, or put into the oven shallow pans in which there are about two inches of boiling water. Cook berries to the boiling point or until the bubbles in the syrup just rise to the top; cook larger fruits, eight to ten minutes or according to the fruit. Remove from the oven, slip on rubber, first dipped in boiling water; then fill the jar with boiling syrup. Cover and seal. Place the jars on a board and out of a draft of air. If the screw covers are used tighten them after the glass has cooled.
Large fruits, such as peaches, pears, quince, crab-apples, etc., will require about a pint of syrup to each quart jar of fruit. The small fruit will require a little over half a pint of syrup.