The Technique of FURNITURE MAKING

True dry rot (Lacrymans merulius)

This is an indoor type, and of all the wood - destroying fungi the most serious as it will attack dry seasoned timber if the conditions are suitable. Initially, the infection needs damp,
badly ventilated surroundings, but once the fungus has taken hold it will carry its own water in wide thread-like hyphae which can penetrate thick brickwork in search of fresh material which it rapidly consumes, leaving the characteristic deeply cleft, cube-like charring, often hardly noticeable under painted surfaces except as local sinkages. In dark conditions the fungus may appear as a white woolly growth, or a smooth fan-shaped grey skin with ragged edges exuding moisture droplets, but if light is present then the typical fruit-bodies will appear. Those who have seen a fully formed fruit-body, sometimes many feet across, with its leprous - grey skin suffused with livid patches of white, yellow and lilac-blue, and peppered with rust - red spores are hardly likely to forget the experience.

Treatment for dry rot must be drastic: all infected woodwork cut away and burnt, infected brickwork and non-wood materials scorched with a blow torch, and treated with an efficient antiseptic. Sound wood in the vicinity should be thoroughly brushed over with either a water soluble preservative such as commercial sodium fluoride (4 per cent), zinc chlorate (5 per cent), applied hot if possible; or one of the commercial solvent-type preservatives recommended for the purpose. Care should be taken with all these chemicals in confined spaces, for although they are not intrinsically dangerous to handle they must necessarily be highly toxic if they are to be effective.

Several other dry rots, notably the cellar fungus (Coniophora cerebella), attack house woodwork, but they require continuous moisture and therefore present no hazard to dry timber.

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The Technique of FURNITURE MAKING

ESTIMATING THE COST OF MAN-HOURS IN HANDWORK

Where no previous records are available the proprietor must assess his own capabilities and those of his employees. Common joinery items are usually in softwood of fairly large dimensions, with …

Costs of man-hours

The total cost of man-hours at the rates paid, plus overtime rates where applicable, plus health insurance, pensions, paid holidays, etc. have to be considered. Here again these may be …

Appendix: Costing and estimating

Costing is the pricing of completed work taking into account not only all the direct expenses— materials, wages and insurances, fuel and power, machining costs, workshop expenses, etc.—but also a …

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