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Double Spiral Wheels For These Wheels The Block Or Nave Must Be

as long as the height of the worms, or spiral lines, but must be made

very thin, and as light as possible. In this block must be fixed

several spokes, which must diminish in length, from the wheel to the

top, so as not to exceed the surface of a cone of the same height. To

the ends of these spokes nail the worms, which must cross each other

several times: close these worms with illuminations, the same as those

on the single wheels; but the horizontal wheel you may clothe as you

like. At the top of the worm place a case of spur-fire, or an amber