The length of these reflectors can be determined by the angle of the lens when covering the picture.
The reflectors must not interfere with the light between the picture and the lens, but they must be sufficiently large to prevent any direct light reaching the lens from the lamps.
The reflectors are made of sheet tin or nickel-plated metal bent to a curve as shown, and extending the whole height of the lantern.
Scientists have discovered just how to arrange prisms, lenses, and reflectors so the light will travel to the farthest possible distance.
The carrying of the light to such a tremendous distance is due to the strong reflectors employed in conjunction with the light itself.
He tried to peer out through the dimness, but could not see anyone, although he could see two or three lances of lights that he knew were the reflectors of the gangsters.
Then he hunted up a metal-worker, and had reflectors made to his order and specifications, and fitted to one side of the lamps.
There are two hundred and fifty of these reflectors arranged in a circle four hundred yards in diameter.
I could still detect the great circle of reflectors with which our way was to be opened.
It is a fact worth knowing, that reflectors may be so constructed as to throw all the available daylight into any required direction; and in one instance the reflector may be made to serve at the same time as a dwarf venetian window-blind.
Through the glazed sashes, the reflectors are seen arranged upon the chandelier, connected with the revolving apparatus.
These were fitted to thereflectors at Inchkeith, within view of the writer’s windows in Edinburgh.
Reflectors raised to the parabolic-curve, made from copper plated, in the proportion of 6 oz.
The reflectors originally employed were casts in plaster of Paris, from a mould formed to the parabolic curve, and lined with facets of mirror-glass.
The reflectors in general use measure over the tips twenty-one inches as applicable to stationary, and twenty-live inches for revolving lights.
To obviate such dangerous mistakes, there was no other method but the introduction of a light from oil, with reflectorsinclosed in a glazed light-room.
A variety of all these lights is introduced by interposing before the reflectors plates of red glass, which produce the beautiful red light alluded to in the lines of Sir Walter Scott, when he notices the 'ruddy gem of changeful light.
The advertisement stated the following particulars:--'The light will be from oil, with reflectors placed at the height of about one hundred and eight feet above the medium level of the sea.
That noble structure was lighted by tallow candles, without reflectors or the aid of any kind of apparatus for concentrating the light.
Defn: An instrument for determining the size or distance of inaccessible objects by means of two reflectors on a common sextant.
Optical square, a surveyor's instrument with reflectors for laying off right angles.
Defn: A lamp with lenses or reflectors to collect the rays of light and throw them in a given direction; -- used in lighthouses.
Speculum metal, a hard, brittle alloy used for making the reflectors of telescopes and other instruments, usually consisting of copper and tin in various proportions, one of the best being that in which there are 126.
Defn: Causing no loss of light; -- applied to reflectors which throw back the rays of light without perceptible loss.
Some time elapsed before reflectors were much used.
Indeed, we had one in this tragedy, but it was upon the stage; and that's the reason why your Reflectors would break the glass, which has shewed them their own faces.
The lawful authority of an House of Commons I acknowledge; but without fear and trembling, as my Reflectors would have it.
Spherical reflectors were introduced in about 1780 and parabolic reflectors about ten years later.
His device was essentially a parabolic mirror similar to the reflectors now widely used in automobile head-lamps, search-lights, etc.
Reflectors are usually employed in military search-lights, and in order that the beam may be as nearly parallel (minimum divergence) as possible, the light must be emitted by the smallest source compatible with high intensity.
The early flashing lights were obtained by means of revolving reflectors which gathered the light and directed it in the form of a beam or pencil.
The control of light by means of reflectors has been studied for centuries, but until the advent of the electric arc the light-sources were of such large areas that effective control was impossible.
Reflectors of a fluorescent red dye have been used with some success, but such a method reduces the luminous efficiency of the lamp considerably.
In earlier geodetic surveys Argand lamps had been employed with parabolic reflectors and with convex lenses, but apparently these did not have a sufficient range.
The lamps were equipped with reflectors and the resulting illumination was 700 foot-candles.
Inasmuch as this was before the use of efficient reflectors and lenses, it is obvious that the early lighthouses were rather feeble beacons.
When used at night, tungsten lamps in reflectors indicate the positions of the arms.
In another test the production under a poor system of lighting by means of bare lamps on drop-cords was compared with that of an excellent system in which well-designed reflectors were used.
They may be equipped with reflectors and other optical devices to direct or to diffuse the light as required.
These were "barrel" lights with reflectors several feet in diameter, the whole output sometimes weighing as much as several tons.
For this reason work of precision must remain the province of refracting telescopes, although great reflectors retain the primacy in the portraiture of the heavenly bodies, as well as in certain branches of spectroscopy.
Refractors have always been found better suited than reflectors to the ordinary work of observatories.
Reflectors are brilliant engines of discovery, but they lend themselves with difficulty to the prosaic work of measuring right ascensions and polar distances.
Sir John Herschel's views as to the nature of nebulæ were considerably modified by Lord Rosse's success in "resolving" with his great reflectors a crowd of these objects into stars.
No hostile demonstration was made as they dropped lower and lower, however, and Seaton, with one hand upon the switch actuating the zone of force, slowly lowered the vessel down past the reflectors and to the surface of the water.
Those reflectors are probably solar generators, and they cover the whole island except for that lagoon right under us.
Among the company was Mr William Hutchinson, dock-master of Liverpool, who seizing the idea, made use of copper lamps, and formed reflectors much in the same way as the gentleman before mentioned.
In the fixed lights eight lamps and reflectors are used, and are arranged in an octagonal lantern; they do not differ much in appearance from the others.
For reflectors the wick is nearly an inch in diameter.
This being a revolving light, a number of reflectors were fixed to the iron sides of a quadrangular frame, and the whole caused to revolve once every minute by means of clockwork.
The light consisted of fifteen argand lamps, placed within smooth concave reflectors twenty-one inches in diameter, and arranged in two horizontal circles one above the other, facing every way excepting directly down the Cape.
Since it is so much easier to make large reflecting than large refracting telescopes, you may ask, why the latter are ever attempted, and why reflectors are not exclusively employed?
The light is produced by twenty-one parabolic reflectors of copper, plated with silver, and having each an argand lamp in its focus.
The reflectors are disposed of in three clusters, of seven in each cluster, and the frame in which they are fixed stands perpendicularly to the horizon, on a shaft united to a machine below, which makes the whole revolve every two minutes.
An instrument for determining the size or distance of inaccessible objects by means of two reflectors on a common sextant.
In reflectors this is effected by giving a parabolic form to the concave surface of the mirror.
The court is illuminated at night by concealed light thrown on the walls from reflectors in the forms of interesting green shells resting on shapely standards.
The towers stand out against the night sky, glowing with the hidden lights like living coals, changing to pastel tints of blue and green, most beautiful of all when the reflectors convert them into shafts of white.
Great cleanliness is enforced in all that belongs to a lighthouse, the reflectors and lenses being constantly burnished, polished, and cleansed.
These reflectors were formed of facets of mirror-glass placed in hollow paraboloidal moulds of plaster.
The operation was repeated, until he could produce similar pictures by a suitable arrangement of his lenses and reflectors known to no other than himself.
Place the lamps in the corners of the box, next to the front, and tack in back of them the pieces of tin for reflectors (A, Figs.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "reflectors" in a variety of sentences. We hope that you will now be able to make sentences using this word.
