[Clarke, William], 1800-1838 · Boston, Munroe and Francis · leaf 116
rum, cross these papers, and draw lines parallel to the divisions ofthe colors : hi these divisions cut out such figures as \ ou may iind will havean agreeable effect, as flowers, trees, animals, &c. When you have placedone of these papers in its proper position, hang a black cloth or paper… … If, while one of the prisms remains at rest, the other be revolved on itsaxis, the continual alteration of the colors will afford a pleasing variety :which may be further increased, by turning the prism round in different di-rections. When the prisms are so placed that the two spectrums…
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