These semicircles and the circles A'A' are joined by tangents and short arcs struck from the centre of the figure.
But his brilliantly white, strong teeth which showed in two unbroken semicircles when he laughed--as he often did--were all sound and good, there was not a gray hair in his beard or on his head, and his whole body gave an impression of suppleness and especially of firmness and endurance.
They abandoned one another, abandoned all their heavy baggage, their artillery, and half their men, and fled, getting past the Russians by night by making semicircles to the right.
These intersections determine the centres of the semicircles CC which form the ends of the respective knuckles.
Straight lines and semicircles were utilized for the non-metallic elements, carbon, nitrogen, phosphorus and sulphur!