"Dioptric Floating Light. Elevation." —The Encyclopedia Britannica, 1910

Dioptric Light

"Dioptric Floating Light. Elevation." —The Encyclopedia Britannica, 1910

"Dioptric Floating Light. Horizontal Section." —The Encyclopedia Britannica, 1910

Dioptric Light

"Dioptric Floating Light. Horizontal Section." —The Encyclopedia Britannica, 1910

"A projecting edge, rim, or rib on any object, as the rims by which cast-iron pipes are connected together, or the marginal projections on the tires of railroad-car wheels to keep them on the rails." -Whitney, 1911

Flange

"A projecting edge, rim, or rib on any object, as the rims by which cast-iron pipes are connected together,…

"A projecting edge, rim, or rib on any object, as the rims by which cast-iron pipes are connected together, or the marginal projections on the tires of railroad-car wheels to keep them on the rails." -Whitney, 1911

Flange

"A projecting edge, rim, or rib on any object, as the rims by which cast-iron pipes are connected together,…

"A projecting edge, rim, or rib on any object, as the rims by which cast-iron pipes are connected together, or the marginal projections on the tires of railroad-car wheels to keep them on the rails." -Whitney, 1911

Flange

"A projecting edge, rim, or rib on any object, as the rims by which cast-iron pipes are connected together,…

"A machine for bending the edges of boiler-iron, ship-plates, or sheet-metal to form a curved or bent edge or flange." -Whitney, 1911

Flanging Machine

"A machine for bending the edges of boiler-iron, ship-plates, or sheet-metal to form a curved or bent…

"aa is the mast, b tackle hook, c, c brass flanges for fixing parts of lantern together, e and g weather guards, h plate glass front of lantern, i shutter by which lamps are trimmed, k lamps, l silver reflector. Revolving catoptric apparatus was applied to floating lights in England, and M. Letourneau, in 1851, proposed to employ a number of sets of dioptric apparatus in one lantern." —The Encyclopedia Britannica, 1910

Floating Lights

"aa is the mast, b tackle hook, c, c brass flanges for fixing parts of lantern together, e and g weather…

"No part of the equatorial mounting is shown in the figure, as it resembles every respect that usual Fraunhofer mounting. An adapted h is fixed on a telescope-tube, made of wood, in Fraunhofer's usual fashion. To this adapter is attached a flat circular flange h. The slides carrying the segments of the divided object-glass are mounted on a plate, which is fitted and ground to rotate smoothly on the flange h. Rotation is communicated by a pinion, turned by the handle c, which works in teeth cut on the edge of the flange h. The counterpoise w balances the head about its axis of rotation. The slides are moved by the screws a and b the divided heads of which serve to measure the separation of the segments. These screws are turned from the eye-end by bevelled wheels and pinions, the latter connected with the handles a', b'." —The Encyclopedia Britannica, 1903

Heliometer

"No part of the equatorial mounting is shown in the figure, as it resembles every respect that usual…