This section is from the book "The Scientific American Boy", by A. Russell Bond. Also available from Amazon: The Scientific American Boy.
We were now ready to cut out and frame the doors and window openings. The front window of the cabin was to be close beside the door, so we merely widened the door opening at the top to include the window opening as well (see Figs. 271 and 272). The door was made 2-1/2 feet wide, and was cut down to the foundation logs. The window opening was cut to a depth of 24 inches. Before sawing out the opening we wedged pieces of wood between the logs along the line we were to follow with the saw, so as to keep them in place. After the opening had been made a couple of stout boards were nailed to the sawed ends of the logs at each side, to hold them securely in place and make a suitable framing for the door. The cleats were then removed. The foundation log and the one at the top of the opening were flattened, to serve as the sill and lintel of the door. Between the door and window a short post was wedged in place.

Fig. 272. The Finished Roof.
This post was flattened on opposite sides, so that the door jamb could be nailed against it on one side and the window frame on the other. The side window was next cut out and framed. After it had been framed it measured 2 feet square.
 
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