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The coilhouse for the Decca coils used wooden platforms and the spec was
mahogany, kiln-dried for (I think) a month, then coated with water-repellent
gunge. One day a new set were put in and when the power was switched on two
transverse legs literally exploded. Turned out the contractor had cut a few
corners and not dried them properly. Thereafter, thermometers (alcohol) were
inserted into the legs before switching-on and if the temperature rose above 60
degs C after switch-on power was reduced until temp stayed stable, then
gradually increased as the wood dried out properly. Once dry, it stayed
dry because the RF chased out any moisture.
The coil
formers were always Delmoldin compound (too heavy and expensive to use for
everything!)
Walter
G3JKV.
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