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8, Fleet Street, Temple Bar, London, E.C.
NEWTON’S PATENT
TRIPLE ROTATING ELECTRIC LANTERN.
As now in use at The Royal Society, The Royal Institution of Great Britain, and The Royal Dublin Society, &c.
ELEVATION.
newton’s patent triple rotating electric lantern FOR ONIVERSITIES l INSTITUTIONS.
This is the most perfect electric lantern made, being of the very highest class of workmanship throughout, and specially designed for every sort of optical work.
The body is cylindrical, and constructed entirely of bronzed brass, mounted on 4 brass pillars and mahogany stand.
The base is fitted with Newton’s patent traversing table, which has screw motions travelling in gun-metal dovetails, &c., thus admitting of the arc light being centred and kept absolutely central during use.
The traversing table is made entirely of polished gun-metal and steel, and very steady motions in every direction are obtained by the large milled heads.
The arc light is kept in its position, and the body of the lantern is rotated by means of the handles bringing each front in turn opposite the fixed light, thus obviating the necessity of constant adjustments and enabling any front to be used at a moment’s notice without delay or trouble. A check action is provided to insure exact centring
The lantern body is furnished with 3 doors and sight holes, so that whichever optical system may be in use, there is always a door immediately behind the lamp, and a dark-glass sight hole in front, through whioh the arc may be observed.
A sectional plan of this instrument is given on the next page.
8434 Triple Rotating Lantern, as above, complete, with optical front (No.
8446), slit and diaphragm front (No. 8453), and projection microscope
(No. 8431), but without arc lamp . £115 g q
For Arc Lamps'for these lanterns, see page 68.