His hands were symmetrically placed on the green silk quilt, the palms downward.
This produces an opening and closing of the edges symmetrically with respect to the telescope axis.
These examples show that Napier was in possession of all the conventions and attributes that enable the decimal point to complete so symmetrically our system of notation, viz.
One double web, fixed in the box, is pointed symmetrically, as in fig.
The cups are placed symmetrically on the end of the arms, and it is easy to see that the wind always has the hollow of one cup presented to it; the back of the cup on the opposite end of the cross also faces the wind, but the pressure on it is naturally less, and hence a continual rotation is produced; each cup in turn as it comes round providing the necessary force.