National Geographic : 1917 Nov
Bausch dLomb BALOPTICON Entertains through the sense of sight as the phonograph does through the ear. The Balopticon is not a toy, but a very practical instrument, designed to meet every requirement of a projection lantern. Various models for use with lan tern slides or for the direct projection of opaque objects such as photos, post cards, specimens, etc. Also combination models for both methods, with in stant interchange. The new gas-filled Mazda lamp gives an illuminating equipment superior to the old-style arc lamp, but using less cur harp and rent. Prices range from $26.50 up. o the cor Write for our interesting booklets about the Balopticon and IduTll p ie its uses-also price lists. this le Busch' Lomb Opticl o. 1 n 507 St. Paul Street, Rochester, N. Y. I New York Washington Chicago San Francisco Leading American Makers of High-Grade Optical Products "Mention the Geographic-It identifies you."