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3170 · Webb · "Pavement and Ship Deck Lights" · Page 2 Home > Prism Glass > Patent Index > Page 2 |
 3,170: 2 of 3 |
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Up: Patent Index |
3170 · Webb · "Pavement and Ship Deck Lights" · Page 2 Home > Prism Glass > Patent Index > Page 2 |
3,170: 2 of 3 |
Instead of constructing these with flat reflecting or angular surfaces and approaching the form of a prism on the underside as heretofore I construct the underside in the form of a half or a smaller segment of a plano-convex lens-- the plane surface being uppermost and towards the light whilst the convex surface is downwards and turned towards the apartment or place requiring to be lighted. The convex surface is by preference cast with and forms part of the rectangular or other form of plate with which the usual framework is glazed. In this manner the rays of light entering this improved block and striking the convex lens surface are thus converged and reflected forward into the apartment or ship's hold or other place to be lighted. And in order that this my said invention may be the more readily seen and understood I have hereunto annaxed a drawing illustrative of my invention and will now proceed to describe the same with the assistance of the various Figures and letters of reference marked thereon. Fig 1 is a front view Fig 2 a side view and Fig 3 a plan of one of my improved glass blocks for pavement or ship deck lights. Fig 4 is a Front view and Fig 5 is a plan view of another of my improved glass blocks and Fig 6 is a side sectional view of Fig 1 across the line a-b. In all the views A is the glass plate which is designed to fit the corresponding rebate formed in the frame of the pavement or ship deck light and which although shewn rectangular in the drawing may be of a circular hexagonal octagonal or other required form to suit the shape of the recesses or spaces in the framework requiring to be glazed. B is the plano-convex lens segment which is moulded in one piece with the glass plate A and is either constructed with a straight sectional surface C at or about at right angles with the plate A as seen in Fig's 1, 2 and 3 or such sectional surface is constructed in the form of a curve D as illustrated in Figs 4, 5 and 6. This construction of glass blocks possesses good reflecting properties as by the use of a section of a plano-convex lens as described the rays of light which enter and pass through the glass plate A are mainly reflected forward by striking the convex surface whilst other rays are converged and reflected back upon the sectional surface which in turn reflect them downwards and forward into the apartment ship's hold or other place requiring to be lighted. Having thus particularly described and ascertained the nature of this my said invention together with the best method with which I am acquainted for carrying the same into practical effect I wish it to be distinctly understood that I do not confine myself to the precise curve or segment shewn upon the drawing as the same may be considerably varied without departing from my invention but what I claim as my improvement in Pavement and Ship Deck Lights is:-- Constructing the glass blocks with the underside in the form of a segment of a plano-convex lens and with a sectional surface substantially as and for the purpose hereinbefore described. In witness whereof I the said Thomas George Webb have hereunto set my hand and seal this Fourth day of January, in the year of our Lord One Thousand eight hundred and Eighty three.
Printers to the Queen's most Excellent Majesty. For Her Majesty's Stationery Office. 1883. |