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 sketches show how to convert an ordinary iron bedstead intoa half-test sr. Fig. 1 is a side elevation of a tester head, which might stand out from the wall, say, 20in. or '22!in., giving room for a curtain. Fig. '2 is a plan of a tester head showing a square frame in red deal, say 4 in. by 1 in. The wall may be plugged and the back portion of the frame fixed to it with screws and an iron bracket (see Fig. 3). On this framework a moulding, say 4in. or 4i in. deep, should be planted, and carefully mitred at the corners. Screwed to the under part of the framework are two fretwork brackets of 1-in. wood, one on each side, cut to shape as shown. Behind these brackets may be fixed a small brass rod, as shown, from which the curtains can hang. Or brass hooks may be used instead of the rod if the latter is considered too expensive. Fig. 4 shows the front elevation of the tester head, with a fretwork ornament in the centre of the top of the moulding. This will improve the appearance of the bed, but can be dispensed with. The top of the tester should be covered in with canvas or thin boards.

Fig. 2.

Fixing Wood Tester Head to Bedstead.
 
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