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Preface to the First Edition. Some few months ago the writer was arrauging a limelighk apparatus for advertising purposes, and was anxious to get a book at a moderate price to place in the hands of the man, ignorant till then of everything connected with the lantern, who was ta work it. None of the existing books fulfilled his requirements, being either too elaborate on the one hand, or on the other, while suitable in most respects, limited to the goods of some one firm of manufacturers. A similar want being felt again a few weeks afterwards, this little book was put in hand, in the hopa that it might be of use to others in a similar predicament. It has been written on the assumption that the reader at the outset knows nothing of the lantern or its technology ; terms that he would not otherwise understand have therefore been explained t and the illustrations have been selected to show the principlea upon which the various pieces of apparatus work, rather than the mere external appearance of any particular maker's product. It should be hardly necessary to point out that it contains nothing that is not to be moat probably found elsewhere, some- where Or other, but care has been taken to point out those cases where the author is unable to speak from his own experience. It only remains for him to express his thanks to those firms to. whom he is indebted for the loan of cuts of special forms of apparatus, and to Mr. R. R. Beard, who has been kind enough to give him the aid of his great practical knowledge of the limelight. Another Edition having been called for, the opportunity has been taken to bring the various Chapters once more right up to date. We may mention here that the credit of the experiments upon steel cylinders, referred to on page 26, belongs to the Scotch and. Irish Oxygen Co., of Glasgow. R. 0. B.