The illustrations show two methods of securing papers or photographs in a mailing tube. In Fig. 1 the mailing tube A is shown in cross section and the manner of running the string through the pasteboard walls illustrated. The ends of the string are drawn up and tied over or under the label. If the label is pasted over the string or string ends as they are tied, it makes a sealed package which is rated as first-class matter.

Illustration from The Boy Mechanic, Book 2: 1000 Things for Boys to Do

The String in Either Case Prevents the Papers from Slipping Out of the Mailing Tube (Fig. 1)

The second way is to run the cords in a cross form through holes near the ends, as in Fig. 2, then tie the knots as at BB. In each instance even if the papers fit the tube loosely, they will be held securely and can be easily extracted when the knots are untied.

(Fig. 2)

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