. Lighthouse construction and illumination; . FIXED CONDENSING LIGHTS. Ill Point electric light, the apparatus of which was designed by-Mr. J. T. Chance, for the Trinity House, in 1870 (Fig. 4,Plate XXXI.) In this design Mr. Chance employed theseprisms for carrying out a suggestion of Mr. Douglass, to senda portion of the light from the principal apparatus, down-wards from the lantern to the bottom of the tower, wherethe expanding prisms distribute the rays over a danger lyingat some distance from the shore. 4. Condensing apparatus for Y2^/t of the circle.—FifTS,. 85 and 86 represent the conde
. Lighthouse construction and illumination; . FIXED CONDENSING LIGHTS. Ill Point electric light, the apparatus of which was designed by-Mr. J. T. Chance, for the Trinity House, in 1870 (Fig. 4,Plate XXXI.) In this design Mr. Chance employed theseprisms for carrying out a suggestion of Mr. Douglass, to senda portion of the light from the principal apparatus, down-wards from the lantern to the bottom of the tower, wherethe expanding prisms distribute the rays over a danger lyingat some distance from the shore. 4. Condensing apparatus for Y2^/t of the circle.—FifTS,. 85 and 86 represent the condensing light of Cape MariaVan Diemen, New Zealand, in which the whole light iscondensed into a sector of only 30°, being the greatestcompression hitherto effected by the condensing system. 112 LIGHTHOUSE ILLUMINATION. 5, Twin Pris7ii Condenser.—Fig. 87 shows the apparatus
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