Ans. One-quarter inch holes are bored to insert a keyhole saw through the joint between two boards at each end of the pocket, and as near the beams as possible, then the board is cut at an angle as indicated in [fig. 1,001]. Having sawed across the board at both ends, it is pried out with a chisel as shown.
Ques. How are the holes bored through the beams for the tubes?
Ans. They are bored about two inches from the top with a 9/16 inch bit, slanting downward just enough to give clearance for the brace.
Fig. 1,004.—Device for examining partition interiors. A pocket flash lamp and a little mirror are the only apparatus required to inspect the interior of a wall or partition which would ordinarily be inaccessible. For fishing wires, retrieving cable and inspecting finished work, the lamp and mirror will be found most useful. The mirror has only to be introduced in the outlet hole in the wall, the flash lamp and eye being held behind it as illustrated. The mirror reflects the light of the lamp onto the place to be illuminated, at the same time reflecting the image back to the eye near the lamp. The usefulness of this little device is as great as its simplicity.
Ques. How are the knobs fastened?
Ans. Screws may be used but stout wire nails are satisfactory and are inserted with less labor.
Leather nail heads are slipped on the nails to protect the porcelain.
Ques. How is a ceiling outlet completed after the work has reached the stage shown in [fig. 1,002]?