You can paint in one or more colours, if you wish (see Painting). The vanes can be painted in light and dark bands crossways, causing an appearance, when revolving, of concentric rings (like a target). By having two axles or spindles (Fig. 152) two sets of vanes can revolve at once, and, by slanting the vanes of the two sets in opposite ways, the two will revolve in contrary directions.
Fig. 152.
Fig. 153.
The weather-vane can be made of two pieces (Fig. 153).
A more elaborate affair (Fig. 154) is made on similar principles, but requires more care. The construction is obvious. Before beginning work read carefully Marking, Rule, Square, Saw, Plane, Knife, Spokeshave, Drawshave, Rounding Sticks, and look up any other references. The general dimensions of the one illustrated are: length of main frame (in which spindle turns) 9", height of one end 4½", height of the other end 2½"; length of weather-vane (from main frame) 10", width at end 4½"; length of revolving fans 1', width at ends 2". The spindle is held in the main frame on a slant (Fig. 155) to lessen any tendency to slip out, so the hole through which it passes should have a corresponding slant (see Boring). The revolving fans or vanes are reduced to round pins at the small ends and fitted tightly into holes bored in the head of the spindle, all the vanes being turned to have the same slant. Care will be required to bore these holes so that the vanes will be equidistant and revolve in the same line.
Fig. 154.
