junction of the two metals, galvanic action set in.
As a general axiom it may be averred that whenever brass or copper comes into direct contact with aluminum exposed to sea-water, corrosion is very rapid. It may also be averred that aluminum rivets can be made fully as strong as those of any other metal. Thus there is no good reason for using bronze rivets in the construction of an aluminum vessel.
The conclusion I arrive at is that aluminum as a material for a racing yacht should not be condemned until further experiments have been made. In strength and lightness it surpasses every other metal.
It is the general opinion of ship-*builders that the best system of construction is to use one material alone in a vessel. Let her be all wood or all one metal, and then the strains will be equal and corrosion will be avoided. There is no question that wood should be used in all of the smaller craft up to the 51-footers, at any rate. Strength and lightness may be most effectually combined by the double-skin system of construction, which is by all odds the most efficient and lasting. In boats larger than these, steel may be the material of the hull. Metal in small craft is necessarily so thin that unsightly bulges often disfigure the topsides of vessels built of sheet-iron, ships' lifeboats, for instance. It is true, however, that these metal
