This section is from the book "Elementary Sloyd And Whittling", by Gustaf Larsson. Also available from Amazon: Elementary Sloyd And Whittling.

Fig. 62.
Basswood. 1/8 inch.
Size of frame may be decided by pupil with the teacher's approval.
1. Cut two sides and one end square.
2. Draw centre line and construct according to drawing.
3. Place wood firmly on a cutting-board, and with point of knife score and notch lines across the interior about 1/8 inch inside of line until the knife point is through the wood. Cut and score carefully, in a similar manner, the other two sides. Whittle the interior to line.
4. Whittle outer curved end.
5. Sandpaper.
6. The frame may be stained with walnut water stain, and waxed and brushed on the front and narrow faces.
7. Cut cardboard for the back 3/4 inch wider and 3/8 inch longer than opening. Cut strips of cardboard 1/4 inch wide and glue on three sides of the back of cardboard, and, when dry, glue onto frame, making a pocket for the picture.
 
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