This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
The following is a sketch that shows how to convert a Windsor chair into a barber's chair. Make two bracket-, as in Fig. 1, out of elm or other hard, tough wood, and bore a hole through the centre of one, as indicated by the dotted circle. Screw the solid one to the seat of the chair at the back, and the one with the hole bored in to the back of the top piece of the chair. The plain sides of the brackets must be so fitted .that when fixed the two mortises are in a straight line with each other. Now fit a piece of wood about 3 ft. long into the mortises in the brackets, so that it will slide easily up and down. Fix a cross-piece to the top of this, as shown in Fig. 2, and also bore holes up the middle at intervals of lb in. To fix the sliding piece at the height required, an iron pin is used; this should be connected with the top bracket by a short length of chain. The cross-piece should be covered and padded.

Fig. 1.

Fig. 2. " Pavodilos " Joint in Flooring.

Fig. 1.

Fitting Windsor Chair as Barber's Chair.
 
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