26 farmers' a^d mechanics' journal. 



the Presses will be warranted to give entire satisfaction, as to 

 their utility and durability. T think it unnecessary to give any further 

 description at present. The cost of the Press, complete and war- 

 ranted, is I^IOO. Any orders directed to me will be promptly at- 

 tended to. Yours, &c. David Flagg, Jr. 



EXPLANATION OF TFIE PLATE. 

 Plate II. According to the specification, this improvement 

 consists, in making the moulds D, D, D, revolve, being let into the 

 extremities of four short arms. The Inventor now uses cast-iron 

 arms and moulds, having Ihem cast entire. A brick being put into 

 the vertical mould D, it is turned until stopped by a trigger, (nailed 

 across the arms when of wood, or cast on the arms when of iron,) 

 which falls on the slide E, pushed along by a pin in the arm, as 

 the mould turns to a horizontal position. Power is applied at the 

 end B, of the compound lever, (the fulcrum of which is at G ;) this 

 gives the part F, a horizontal position, and thereby slides the piston 

 C, on the brick, and presses it. It also pushes the slide E, back, 

 by a cleet on the piston. Another brick being put into the suc- 

 ceeding mould and turned to a horizontal position, is pressed as 

 the one preceding. At the same time, the piston A, pushes out 

 the first brick, by pressing on the bottom of the opposite mould, 

 the bottoms all being moveable, and the opposite ones connnected 

 by iron bars. 



NAVAL, ARCHITECTURE. 



It is somewhat strange, that, while so much has been said, writ- 

 ten, and done, from time immemorial, upon Civil Architecture and 

 its several branches, comparatively nothing has been written (in 

 this country at least) upon Naval Architecture. Certainly it can- 

 not be from want of experience in the art of constructing vessels. 

 The many important improvements that have taken place in ship- 

 building, evince that there is no want of skill, judgment, or expe- 

 rience, in the art ; and yet, but little is written upon it, — nothing 

 to perpetuate, and to hand down to posterity the essential and 

 fundamental principles, upon which such structures depend. No- 

 thing to warn others from experiments, and attempts which have 

 proved abortive, or to guide to the attainment of particular objects, 

 which, from years of experience, some can accomplish without 

 difficulty. There arc many who have grown grey in the business, 

 — who can construct their own models, — can see the future ship in 

 their " mind's eye," and foretell, or rather, form its character, as 

 it progresses under their hands towards completion. There are 

 others again, who will take the same model, and follow, apparently, 



