Even from a distance it was obvious that his calculation was accurate.
This triangle, for the convenience of calculation, we divide into two right-angled triangles.
In every case the calculation proved fallacious.
Since heats of formation afford such convenient data for calculation on the above method, they have been ascertained for as many compounds as possible.
Although the matter can be fully treated only upon the basis of a dynamical theory, it is proper to point out at once that there is an element of assumption in the application of Huygens's principle to the calculation of the effects produced by opaque screens of limited extent.