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Wilson's Dioptric Pavement Light Lens


  • 117, Charterhouse St., Charterhouse Sq., London, E.C.
  • 24 Harrison Street, Gray's Inn Road, London, W.C.



Wilson's Patent Dioptrical Lenses, 1890
Wilson's Patent Dioptrical Pavement Lights.

WILSON & CO. beg to call the attention of Architects and others to the superiority of Wilson's Patent Dioptrical Lenses for pavement and floor lights. These Lenses are constructed on strictly scientific principles, and have been approved by some of the highest authorities on Light. They are made of the Best English White Flint Glass, of high refractive power, and transmit more light than any other form of Lens yet introduced. The reflecting surface being spherical, the rays of light are distributed in every direction.

Wilson's Patent Lenses for Floor Lights, Deck Lights, and Pavement Lights of every description. Samples Lenses on application.

Wilson's Patent Lens for Stall Boards, Cellar Flaps, Ornamental Tile and Glass Pavements, Safety Coal Plates. Plans, Prices, & Estimates Free.

Fig. 1 shows how the ordinary prism or semi-prism, by receiving the rays on a plane reflecting surface, throws them forward at one angle only, in parallel lines close to the ceiling. Fig. 2 represents the Patent Dioptrical Lens, and shows by comparison how the rays of light, striking on the curved inner surface, are reflected toward through the face of the lens in every direction, filling the whole angle of 90°, thus illuminating the apartment from floor to ceiling and from wall to wall.
From the above diagram it will be seen wherein consists the advantages claimed for Wilson's Patent Lenses. The objection to the semi-prism is that it reflects the light, as shown in Fig. 1, at such an angle as to be of little use, and more especially if the line of the ceiling is below the line of the pavement; then the value of the semi-prism as a light projector is entirely lost.
It will be seen also, on reference to the above diagrams, in Fig. 1 that the first row of semi-prisms obstructs the rays of light from each succeeding row, whereas in Fig. 2 the bulk of the rays of light are projected at such angles as to pass unobstructed into the room.

The correctness of these illustrations can be practically demonstrated to any Architect desirous of testing them.

WILSON & CO., 117, Charterhouse St., Charterhouse Sq., London, E.C.
The British Architect · 1889

Wilson's Patent Dioptrical Lights
per ft. super.
 s.   d. 
Pattern No. I—4 × 3 flint-glass lenses 9 0
" " 2—4 × 3 semi-prism 8 0
" " 3—4 × 3 patent duplex 6 0
" " 4—4 × 3 plano-convex 5 0
" " 5—4 × 6 patent dioptric 8 0
" " II patent combination 5 6
¾ rough plate glass in squares, 4in. × 3in., 4in. × 6in., 4in. × 9in. 4 6
Improved illuminating stall-board lights in various patterns, from 5 0
Improved cellar flaps with guttered curb frames, price extra over fixed lights, from 5 0
Ornamental combination till and glass-illuminating pavements, also treads and risers, from 6 0
Improved silvered daylight reflectors 3 6
Laxton's Builders' Price Book for 1892 · p.253

Wilson's Patent Dioptrical Lenses, 1889


Wilson's Dioptrical Lenses are the only Lenses which properly distribute the Light, and are made of the Best White Flint Glass of High Refractive Power, well annealed so as to stand variations in temperature. Approved by some of the highest Scientific Authorities on Light, and for UTILITY and ECONOMY are the best in the Market.

Illustrated Catalogues—Plans and Estimates for all Kinds of
On Application to
Pavement Light Engineers, Ironfounders and Glass Manufacturers
Academy Architecture and Annual Architectural Review · 1889
Getty Research Institute

The "Safety" pavement lights of Messrs. WILSON & Co., 24 Harrison-street, Gray's Inn-road, W.C., are constructed so as to meet a number of the objections brought against pavement lights, and at the same time fulfil the special purposes for which they are provided. Among other things, the manufacturers aim at the prevention of slipping and at meeting the objection so often made to the projecting studs on the surface of the lights, especially in front of shops and at entrances. The upper portions of the frames are made entirely of lead, so as to constitute a firm and even hold for the foot, and form a more sightly pavement light, as the lead is quite flush with the glass. The lights, we may mention are also made with the lead bars partly intersected with ornamental tiles or mosaic work.

The International Building Trades Exhibition · The Surveyor · May 5, 1899 · p.584

Before proceeding further, we may refer again to the contents of Bay 9, to which a brief reference has previously been made. The exhibit was that of Messrs. Wilson & Co., 24 Harrison-street, Gray's Inn-road. This firm had fitted up a dark room for the purpose of showing the effect of their prismatic vertical lights, and the result achieved was certainly remarkable. With the exception of a small window admitting daylight, the room was practically dark; but as soon as the prismatic sash was closed the room was well lighted throughout. Any room which is lighted at one end only, and is 100 ft. deep, is naturally very dark at the further end, but by means of this firm's prismatic lenses the light is sent the entire length, and darkness gives way to light. Messrs. Wilson & Co. have been making these lenses for years, but it is only recently that architects generally have given much attention to the subject, and no doubt some of them naturally find it somewhat surprising that they can get for 4s. 6d. per foot a light for which they were prepared to pay, perhaps, double. The firm are also the proprietors of a patent system of glazing the lenses, and by means of this the latter are completely locked with it. The lenses, which are made rebated on two sides in front and on the other two sides at back, are fixed in wrought-iron frames, which obstruct only ¼-in. of light, and as the lenses are 5¾-in. square the obstruction amounts to very little over a surface of 27½ square inches. These patent frames can be galvanised or electrocopper plated, or can be made of any metal, to suit purchasers. Another useful patent was to be seen on the stand—a warm and fresh air ventilating stove, which brings 50 to 60 cubic feet of fresh air from the outside per minute into a room, the air being at the same time warmed to a temperature of 60 deg. It is constructed with a hollow hearth under the ordinary tiles, and with pipes leading up to a ventilator in the top of the register stove. Apart from their moderate cost, the advantages claimed for these stoves are the ease with which they can be fixed by any ordinary bricklayer, and the fact that the air always comes into the room, whereas in the case of many systems it is impossible to say in what direction the air will go. Messrs. Wilson also showed their patent safety pavement lights, the object of which is to prevent slipping. We understand that they have recently been supplied to the King's Cross and Manchester railway stations.

The International Building Trades Exhibition · The Surveyor · May 26, 1899 · p.691

Wilson's Patent "Safety" Pavement Lights


PREVENT SLIPPING. Lead Frames. Level Tread for the Foot. Deaden the Sound. Do away with Studs.
Used at Hammersmith Town Hall and elsewhere.

WILSON'S PATENT DRIPLESS Lights. Prevent Condensation Falling.
Used at North-British and M.I. Co., Threadneedle Street Commercial Union I. Co., Cornhill; Bankers' Clearing House, and elsewhere.

WILSON'S "DIOPTRIC" LENSES. Utilise double the light of any other. Cost the same as semi-prism.

Mr. BRUCE J. CAPELL, A.R.I.B.A., writes: "The Hackney and Islington Vestries have given their consent to work of an exceptional character being carried out with your non-slipping lights. In the case of the Hackney Vestry the consent was entirely conditional on these lights being used."


The International Building Trades Exhibition · The Surveyor · June 30, 1899 · p.xi