Restoring Decayed Wood.—The worst cases of decay or of worm-eaten wood can be perfectly restored in this manner:—Take fine sawdust of the same kind of wood as the original. Let it be as fine as possible, either cut with a refined saw or powdered in a mortar. Sift it. Then with acidulated glue, or else plain, clear, white Salisbury glue for light wood, make a paste, well mixed. With this you can fill up holes (using a spatula or flexible knife or ivory paper-knife). But, what is more, you can thus make a very strong artificial wood which can be moulded into any form, and when dry polished by cutting over the surface with a chisel or flat gouge, and using a file or glass-paper to finish. In fact, you can mould or model figures with this wood-paste by itself. Putty is generally used for such repairs, but the wood-paste is like wood, and quite as durable.
If you have a mould of plaster of Paris, boil it in oil, clean it, and then oil it. With the wood-paste you can make ornaments which can be applied to plain wood surfaces.
Splints, fractures, cracks, holes, corners broken away, are all easily restored with wood-paste. In moulding it the fingers should be oiled to prevent its sticking.
Any kind of dry sawdust can thus be converted into a paste, which, when dry, becomes wood. It may be very much hardened under a hydraulic-press or by a wooden hand-roller. Housekeepers should use this composition for filling up rat-holes, or any kind of crevices in furniture, or panels, or doors and walls, especially where such cracks harbour insects.
It would be perfectly possible to construct an entire house of such wood-cement, and one which would be perfectly durable, or even more so than wood, since beams and planks thus made never crack, split, nor warp. With it the boldest vaulting and arch work can be more easily made than in stone or with wood, as the latter is usually worked. As builders in Turkey form domes by making circles of clay or mud, and gradually add to the first a smaller one, so by using wood-paste the largest space could be covered or domed over without building a scaffolding. There are many places in the world where (as in the prairies of America, Russia, and Hungary) large timber is wanting, but where small wood for sawdust is more available, and yet where, as cattle abound, glue would be very cheap. This material deserves more serious attention than it has ever received.
More than twenty years after I had invented, or at least projected and put in practice, this method of making artificial wood, I found the following in the Manuel Général du Modelage, par F. Goupil; Paris, Le Bailly:—
“To make vases, take fine dry sawdust and pass it through a sieve. It may be made into a paste with a compound of turpentine, resin, and wax. Or mix the adhesive with five parts of best strong white glue (colle de Flandre) to one part of fish-glue. Melt them separately, ... pour them together, boil to a proper consistency, and mix with the sawdust. By this process figures can be cast which, when finished by hand, exactly resemble carved wood.”
Another recipe is to take 750 grammes of strong glue to 1½ kilogramme of gall nuts. To be mixed cold. Mix in hot water with sawdust.
Since writing the foregoing I have found the following recipe in a MS. of 1780, a family heirloom kindly lent me by Miss Roma Lister:—
“To cast Wood in Moulds as fine as Ivory, of a fragrant Smell, and indifferent Colours.—Dry Lime Tree wood sawdust in a pan by a gentle fire, and beat it to a fine powder in a stone mortar. Sift it through Cambric, and keep it in a dry place free from dust. Then add to an equal quantity of Gum Tragacanth and Gum Arabic 4 times the quantity of Parchment Glue. Boil them in Pump Water, and filter through Linen. Stir into it the Wood powder till it becomes of the substance of a thick pastry; stir it all together, and set it in a glazed pan in hot sand, for the moisture to evaporate till it be fit for casting. Mix your colours with the Paste, and to give it a Scent put Oil of Cloves or Roses or the like, which, if you please, you may mix with powdered Amber. Anoint the mould with Oil of Almonds, and put your paste into it. Let it dry for 4 or 5 days, then take off your mould, and the Images will be as hard as Ivory. You may cut, turn, carve, and plane this wood, and it will have a fine scent. The mould may be Plaster of Paris, but it were better made of metal.”