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parallel, or inclined to one another, and to the Horizon in any given
Angles.

_Illustration._ Let F [in _Fig._ 18.] be the wide hole in the
Window-shut, through which the Sun shines upon the first Prism ABC, and
let the refracted Light fall upon the middle of the Board DE, and the
middle part of that Light upon the hole G made in the middle part of

as the second. And this happened whether the Axis of the two Prisms were parallel, or inclined to one another, and to the Horizon in any given Angles. _Illustration._ Let F [in _Fig._ 18.] be the wide hole in the Window-shut, through which the Sun shines upon the first Prism ABC, and let the refracted Light fall upon the middle of the Board DE, and the middle part of that Light upon the hole G made in the middle part of that Board. Let this trajected part of that Light fall again upon the middle of...