The wind being fair, we stood out of the Dart in the afternoon, and steered for the Start.  At the end of the Start is a lofty tower.  It was visible at sunset, when the wind fell almost calm.  The tide was favourable, however, and we made some way.  In a short time a brilliant revolving light flashed across the waters.  It can be seen nineteen miles off, the tower being two hundred and four feet above high-water. In the tower is a bell, which is rung during fogs, to warn ships from approaching too near.  The light is a dioptric or lens-light of the first order.  The apparatus consists of a central powerful lamp; round this is placed an arrangement of glass, so formed as to refract these beams into parallel rays in the required directions.