Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration (1906)

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PREFACE A.BOUT the year 1851 there was placed at my disposal a Lantern, of a character very unusual (at that time) for any boy of my age to possess a share in; in fact it was one of Carpenter and Westley's * Phantasmagoria' lanterns, unrivalled at that period of transparent sheets and sperm-oil. The result was that Optical Projection, in its various forms, has been with me more or less a hobby ever since; less followed for some years during which pursuits of a more open-air character, 1 for sufficiently serious reasons, engaged more of my attention, but never abandoned, and again and again returned to with renewed interest. Mere slides of course came first, but I soon discovered for myself that things could be pro- jected as well as pictures; and for a long time past I have found much relaxation from my literary work, in reducing various optical and other physical experiments to conditions which enable an audience to behold them upon a screen, and in devising contrivances for making the beautiful phenomena of Polarised Light more spec- tacularly imposing. Since the publication of a little 1 Poultry-breeding.