General Science. 
197 
marine of Great Britain, compared with the trading vessels of 
Holland; and observes, that though the common marine barome- 
ter is perhaps too cumbersome for the ordinary run of fishing 
and coasting vessels, yet Adie’s sympiesometer is so extremely 
portable, that it might be carried even in a Manx boat Each 
lot of such vessels has a commodore, under whose orders the fleet 
sails : it would therefore be a most desirable thing, that a sym- 
piesometer should be attached to each commodore’’s boat, from 
which a preconcerted signal of an expected gale or change of 
weather, as indicated by the sympiesometer, could easily be 
given. 
4S. On the Employment of Steam-Vessels for distant Voy- 
ages. — As the application of steam to vessels crossing the At- 
lantic, or navigating to distant regions, is a subject of great im- 
portance, we have pleasure in recording the following obser- 
vations by an intelligent correspondent, on the American steam- 
vessel the Savannah. Some account of this ship has appeared 
in most of the newspapers, and in some periodical works; but 
as the statements that we have seen speak altogether in favourable 
terms of this application of steam, it is only proper that the dis- 
advantages of it should also be known. 
The Savannah steam-ship. Captain Rogers, arrived at Liver- 
pool on the 20th June last, after a passage from land to land of 
tiventy-one days. The steam-engine was in use during eighteen 
days of the passage ; which, being calculated to bear twenty 
inches of steam, operated, in moderate weather, with good effect. 
This vessel, though of 350 tons burden, is only calculated for 
carrying passengers ; the whole hold being requisite for the 
stowage of coals sufficient for a twenty days passage. She is 
fitted up in a superior style, and has thirty-two state-rooms ; 
the accommodation for ladies, which is in an after cabin, is very 
private. 
The steam-apparatus in the Savannah occupies the greater 
part of the hold from the main-mast to the fore mast; leaving 
only a small space in each side suitable for carrying coals. The 
engine is well finished, and the machinery neatly disposed. The 
water-wheels are affixed to a cast-iron axle-tree, passing through 
the sides of the vessel above the bends ^ which is incapable of 
motion in any direction, excepting that necessary for turning 
