Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine (1914)

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CH. X] DO AND DO NOT IN DRAWING 389 6. In drawing with any form of projection apparatus the axial ray must strike the drawing surface at right angles or the image will be distorted (§ 483). 7. Make sure that the mirror or prism reflects the rays upon the drawing surface so that the axial ray is at right angles to the surface (§482-483). 8. Use a condenser of sufficient diameter to fully light the object (§ 467, 533) 9. Get the desired size for the drawing by making the distance of the drawing surface greater or less, or by using a different optical system for the projection (§465, 507-508). 10. Take great pains to light as brilliantly as possible (§ 497, and Chapters I, II, and IX). 11. Take care to have the images on the drawing surface erect (§512-526). 12. In using projection apparatus for photography, remember the principles of good projection, and the requirements for good photography. 6. Do not draw distorted pictures ; therefore do not have the axial ray strike the drawing surface obliquely. 7. Do not forget to incline the mirror used in drawing so that the axial ray will strike the drawing surface at right angles. 8. Do not try to project an object larger than the diameter of the condenser lenses used. 9. Do not neglect to give the scale at which every drawing is made. 10. Do not expect good light unless the conditions for it are met. 11. Do not draw inverted images. 12. Do not expect projection apparatus to give good photographs unless sharp, brilliant images are projected, and the photographic part is done correctly.