Miscellaneous Intelligence. 287 
“4th. A hole of half an inch in diameter, kept open for several 
hours in the valve chest, does not sensibly affect the pressure in the air- 
receiver, so abundant is the supply of air; this fact has surprised all 
practical men who have seen the engine ; it proves completely that the 
machine need not be perfectly air-tight, as suppose 
“oth. After putting a moderate quantity of fuel into the furnace, it 
has been found that the engine works with full power for three hours 
without fresh feed, and after removing the fires entirely, it has fre- 
quently worked for one hour.” 
€ pass from these observations on the stationary test-engine to a 
few words on the ship, of which, Mr. Ericsson in his paper does not 
Particularly speak. 
_ Inthe ship Ericsson, there are 4 working cylinders, the diameter of 
each being 168 inches, and the stroke 6 feet. The diameter of the 
Supply cylinders is 187 inches. Iron wire of one-sixteenth of an inch 
1s for the regenerator. The amount of coal consumed by the 
four furnaces per day, is 6 to 7 tons. ‘The disks of the regenerators 
have each 500,000 meshes, and the temperature of the air within the 
Working piston when in action is stated at 444° F. The valve cutting 
off the air on the up stroke is closed when the piston has risen ;53,ths 
of the whole stroke, . 
ve do not at present undertake to discuss the probable success or 
failure of this important enterprise. We have been told that the ship 
a ear 
and others hope ; the contrary must be the desire of all well-wishers 
of humanity. . 
Canadian Institute at Toronto, Capt. J. H. Lefroy, we observe the an- 
rom Can- 
i, Jeans of which these observations have been made during so con- 
siderable a fumber of years, should also be withdrawn from this con- 
nent and returned to England. i 
If its fate as a national observatory is sealed,—and it appears to be 
®etually so.—_we shall be gratified to learn that the local government 
8$'Well as amon military gentlemen occasionally resident in Canada, 
hy © cannot ochtakees it coma be successful in contributing largely, as 
nan, .o? to the progress ; 1¢! 
magnetic, meteorological and auroral observations, Toronto is one of 
