ADVERTISEMENT. xcix

his duty, and the humble degree of credit due to him will be fairly allowed by thosewho are the proper judges of it.

On the grounds just stated, what may in some measure be considered as a Sup-plement to the present Work, though in a great measure disjointed from, and uncon-nected with it, is offered to the Public; and as a manifest proof it cannot contain anything beyond what has been already honestly explained, so that consequently suchSupplement regards merely the practice of the science, it is necessary to observe,that the letter-press will scarcely exceed fifty pages, for it will comprise nothing morethan a technical statement of the qualities and properties possessed by the differentvessels, of which working draughts will be given; to the amount of forty-eight innumber.

The Supplement being in very considerable forwardness, its publication can be pro-mised, without the smallest apprehension of a breach in the performance, on the 1stday of November next. It will contain, as has been already stated, forty-eightdraughts of ships and vessels that have been actually built, and whose propertiesand qualities have been experimentally ascertained. A brief statement of them,printed uniformly with the History of Marine Architecture, will be severally annexedto the draughts. In order to render the selection as interesting as possible, it hasbeen arranged in such manner as to comprise twenty-four ships or vessels of Avarin different rates, and as many intended for the purposes of commerce. These classesare again divided into two equal parts, half of them being the works of Britishartists, and the remainder of those belonging to foreign countries. The smallervessels will be given on a quarter scale, the larger on an eighth, which, as theywill be severally executed Avith the utmost accuracy, has been considered sufficientlylarge for the purpose of actual practice. To the foregoing Avill be added two models,or folding plates, on pasteboard and card-paper, one representing the horizontal derni-section, shewing the Avater-lines of a third rate, the second, a demi-model of its hull,both which being constructed according to a draught given in the selection, will, it ispresumed, enable the mere novice to understand, witii perfect readiness, those linesdescribed in Avhat is called a working draught, which might otherwise be consideredby him confused and unintelligible, and by that means, at least further, the studyof the science.

Specimens