n Fig. 5. Fig, 4, ordinary lantern slide.- The objective APPLICATION OF THE 90 DEGREE PRISM, is a one-quarter portrait lens of good quality. For the support of tanksand to all the uses for which a scientific Jantern is re- other vessels for projection, the table quired. shown in Fig. 2 is used in… … ‘swung below the supporting bar, when the objective may be inserted in the Fig. 6—COURSE OF THE RAYS THROUGH quickly arranged as a vertical lantern, and all of the sleeve, f. This arrangement admits of applying a sys- THE ERECTING PRISM. attachments are constructed so that they may be placed tem of…
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