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The cap when finally fitted will have its upper edge about ⅛ inch below the upper edge of the block. On applying it in this position, holding it there with your fingers, or tying it on with string, and blowing gently into the foot-hole, you will have a pleasant fluty musical note. Probably a little chirp or whistle will be heard before the note comes on. The removal of this defect belongs to the important operation called voicing, of which we shall treat hereafter.

We have cut our boards from the half-inch pine, but as we rise in the scale much thinner stuff will be used. It is well to foresee this in laying in our materials. Red cedar, often used by cabinetmakers for the inside of drawers and wardrobes, makes very pretty pipes, holds the glue well, and has an agreeable odour in working. Harder woods, notably oak, were often used by the old builders. Pear-tree commends itself much in German workshops.

The four or five lowest pipes (CC to EE, or higher) should be of stouter stuff than half-inch, say five-eighths or even three-quarters. The caps of these large pipes will not be glued on but fixed with three screws, and we may modify a previous remark by admitting that in the case of these larger pipes the use of nails is legitimate.