July 20, 1883.) 



SCIENCE. 



69 



two cvlinders each, — one of high, the other 

 of low pressure. — the stroke of piston being 

 thiily iiiclics. Tiic engines are slii;litly in- 

 clined, tiic upper ends of the cylinders lieing 

 drawn iuboaril over the condenser, which is 

 common to both engines, and forms their 

 framing. The boilers are two in number, of 

 the overhead return-due pattern, and measure 

 twenty-one feet and a iialf in length by eight 

 feet and a half in diameter. 



The proper ventilation of all parts of the 

 ship was carefully considered during her con- 

 struction, and the plan adopted has given the 

 greatest salisfnctiou. It consists simply in 

 withdrawing the foul air from the lower parts 

 of each room through small ventilators, by 

 means of a Sturtevant exhaust-fan with Wise's 



steam-motor attachment. The influx of air is 

 from above, through open doors or ports ; ami 

 a constant circulation is maintained, even in 

 the lowest inhabited portions of the ship. 



One of the most interesting features of the 

 Albatross is the system of electric lighting, 

 which has alreadj' been referred to. Some 

 such method of replacing the ding3- lamps 

 common to most ocean vessels was rendered 

 inii)erative from the fact that this steamer is 

 supposed to continue her observations as regu- 

 larly through the night as through the day, 

 and the surrounding surface of the sea nuist 

 also be lighted. To accomplish this, a hun- 

 dred and twenty eight-candle B lamps of the 

 Edison incandescent system are distril)uted 

 through the ship ; every portion, including the 



