1814.] New Patents. 4?! 



durability of the ship : the driving out of the treenails would be 

 attended with Httle expense, as they might be kept in store until 

 wanted, and this mode of ventilation would in my opinion totally 

 supersede the use of stoves, which are not only dangerous but 

 expensive, and in some instances do more harm than good. 



Perhaps, this proposition deserves the more attention, as the 

 treenails have, in some instances, been made of American wood, 

 which has produced the dry rut in the oak timbeis through which 

 they were driven, the dry rot having begun in the treenails. 



Being on the subject of preserving the navy, I beg leave to pro- 

 pose as worthy of serious consideration, whether vessels, which are 

 kept in still water, do not much sooner decay than those which 

 float in running water ; should this idea be well founded, the naval 

 departments would ascertain the fact before any large sum of 

 money be expended in extensive docks, which might produce the 

 great inconvenience of the ships being found unserviceable on an 

 emergency. 



I remain, my dear Sir, yours faithfully, 



Mark Bjeaufoy. 



VI. Query respecting Kails. 



(To Dr. Thomson.) 

 SIR, 



The public will be benefited if any of your scientific readers, or 

 correspondents, can give information through your monthly publi- 

 cation, how a nail can be made that will bear driving into oak, and 

 drawing out if necessary, of metal, cast or malleable; if copper 

 forms a part it must be alloyed not to injure iron ; if iron, cast or 

 malleable, they must be rendered less subject to corrosion when 

 exposed to the sea water. I am. 



Your constant reader and obedient humble Servant, 



Liverpool, May I4th, 1814, P. S. 



VII. Lectures. 



The Summer Courses of Lectures on the Theory and Practice of 

 Physic, Materia Medica, Chemistry, and the Clinical Lectures, by 

 Dr. Roget and Dr. Harrison, will commence at the Medical 

 Theatre, Cireat Windmill-street, on Monday, the 6th of June, at 

 nine in the morning. 



Article XIII. 



New Patents. 



Mauc Isambard BiiUNELL, Chelsea, civil engineer; for a 

 method of giving additit.nal durability to certain descriptions of 

 leather. March 12, 1814, 



G 



