The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular (1877)

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124 8CIOPTICON MANUAL. classes of lantern slides, because they are mostly after the same designs. The set of long astronomical slides has from time immemorial been accompanied by a printed lecture, which, though somewhat antiquated, still answers a pretty good purpose. Could a suitable lecture of similar shape accompany each of the forty sets of scientific illustrations, it would prove advantageous to many, and it would do no harm to any; so we are looking for something of the sort in the near future. But these sets of scientific slides them- selves leave scarcely anything to be desired in the way of fitness and excellence; and we have, moreover, in the Sciopticon an instrument unrivaled for convenience combined with efficiency. As before intimated, little has been attempted in this chapter but to indicate some of the ways of finding descriptions. When the use of the magic lantern was very limited, its slides could be described in small compass; but now, a work that should describe all the slides in use, would hardly be less voluminous than the Encvclopedia Bri- tannica.