Popular Science Monthly 



861 



Side Hatches - 



^"s*?^*-. 



Old construction. Frames were made 

 of short pieces laid out from templets 

 and sawed to shape. Both longitudinal 

 and lateral strength were lacking 



not know how to make them 

 larger. Experience has taught us 

 that the larger the ship the less the 

 cost per ton 

 carried. As 

 long as the 

 tonnage of 

 the wooden 

 ship remained 

 small, it could 

 not compete 

 with the steel 

 vessel whose 



tonnage capacity was many times greater. 



Wooden ships could not be made larger 



because our naval architects did not know 



how to make them long and still rigid 



The layered or laminated sec- 

 tions are notched into both 

 straight sections of the frame 



New construction. Frame members are made 

 from square mill timber. All parts are 

 stressed to increase rigidity; ample provision 

 for transverse and longitudinal strength 



enough to stand up under the load 

 and the vibration of the engines. 

 i The secret of Donnelly's success lies 



in the fact that he has applied the 

 principles of steel-ship construction to 

 the wooden vessel. The American 

 Bureau of Shipping, which insures 

 ships, after the fashion of Lloyds of 

 England, has given the vessel an Al 

 rating for fifteen years. 



The special characteristic of the 

 Donnelly design is that it is made of 

 straight pieces of stock which can be 

 turned out at any sawmill without any 

 tapering or special forming work. This 

 particular characteristic is of the greatest 

 importance at the present time. It enables 



The Donnelly ship is a standardized vessel made up of parts which can be duplicated in any sawmill, shipp)ed 

 to the nearest shipyard and put together in much the same way as the parts of a cheap automobile 



