Illustrated Catalogue Of Magic Lanterns (after November 1889, probably 1890)

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mcintosh battery and optical co., Chicago, ill., h. s. a. 37 heard by the operator alone ; 100 ft. of conducting wire, and a push button to be held in the hand of the lecturer. We put this signal up in two grades ; the cheaper with ordinary annuncia- tor wire ; the better grade in a tinsel flexible cable cord covered with a braiding of mixed silk and worsted, that winds on a spool as easily as ordinary cord. PRICE with 100 ft. ordinary annunciator wire $10.00 « 100 ft. flexible cable cord 12.50 IMPROVED READING LAMP. The ordinary Lecturer’s Reading Lamp is used with a candle and does not give a good light. The Reading Lamp like above cut is furnished with a miniature oil lamp. Kerosene oil is used. When through using, it only takes a moment to remove the burner and fasten it tightly with a soft rubber cork so that there is no danger whatever of any leakage, and the burner and chimney packs snugly into the hood of the lamp. The call-bell has been done away with, as its use in signaling the operator is annoying, and detracts from the interest of the lecture. It is provided with a colored light signal that answers every purpose. This lamp affords sufficient light so that a type-written or man- uscript lecture can be easily read, and at the same time will not illuminate the hall or screen. PRICE, packed in a neat wooden box $5.00