E.—No. 3,

Assuming the height of the tower to be sixty feet, the centre of the light, or the focal plane, will bo about ten feet more; and supposing the ground to be ten feet above higli water mark, we have the focal plane eighty feet above high water, which, with the usual allowance for the height of the deck of a ship, will give the light a radius of sixteen English miles in clear weather. The keepers' dwellings should be erected of wood, at a convenient distance from the lighthouse. I shall be happy to furnish further particulars of this plan, with rough specification, estimate, weight, &c, &c, should such be required. I have, &c., The Hon. Postmaster-General, "Wellington. E. Aylmeb, C.E. =============== •

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PRESIDENT OF MARINE BOARD.