Solid wood and plywoods etc. must not be mixed indiscriminately in carcass-work. For instance, solid sides and plywood tops, bottoms and fixed shelves would have different shrinkage values; so also would plywood sides and solid tops, bottoms, etc. There is, however, no objection to using relatively narrow bearer rails in solid wood to plywood sides or vice versa, as the shrinkage will be negligible. In planning any carcass construction, therefore, a moment's thought as to the probable direction and effect of the normal shrinkage of each part will usually suggest a satisfactory compromise. Framed-up (panelled) carcass sides can be treated as plywood, for here again shrinkage values are usually too small to cause trouble.
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