The book of lantern ; being a practical guide to the working of the optical (1888)

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THE BOOK OF THE LANTERN. 29 be found on page 95, bat in practice I find it a convenient thing to use a tape measure. Upon the circular case of this measure I have certain figures to the effect that such and such a lens requires a distance of so many feet to give a 15 or 18 foot disc. The place of the sheet having been decided upon, it is then easy enough to pay out the required amount of tape, and to fix the position of the lantern.