What's the difference between sciagraph and sciagraphy?

Sciagraph

Definition:

(n.) An old term for a vertical section of a building; -- called also sciagraphy. See Vertical section, under Section.
(n.) A radiograph.

Example Sentences:

Definition:

(n.) The art or science of projecting or delineating shadows as they fall in nature.
(n.) Same as Sciagraph.

Example Sentences:

(1) Apart from clinical examination they use classical sciagraphy, macropictures, tomography, arteriography, gammagraphy of the skeleton, computer tomography, lymphography, histological, and electron microscopic examination.