EDITORIAL. 
and the outer shell of thick brass is fitted with 
alternate cones, and corrugated disks of brass- 
wire gauze. 
When the condenser is in operation, the air blast 
enters through tube A, the upper portion of which 
is bent so as to direct the blast toward the center 
of the first condensing chamber. Water is al- 
lowed to drip from tube C at the rate of approxi- - 
mately 6 cubic centimeters per minute. The cor- 
rugated disks receiving the heat from the inner 
tube by conduction become covered with a film 
of water which is rapidly evaporated by the air 
blast, the heat being thus absorbed. Any excess 
of water in the condenser runs to the bottom and 
is drained away by tube B. The wire-gauze cones 
constantly deflect the air blast toward the central 
heated surfaces, while the inverted cone at the 
bottom of the apparatus prevents the air blast 
from turning downward and escaping by tube B. 
When supplied with 6 cubic centimeters of wa- 
ter and 120 liters of air per minute, the apparatus 
may be fitted to an extractor and run hermetically . 
sealed. Under these conditions, 200 liters of 
ether vapor per hour may easily be condensed 
without any excess of pressure being observed. 
This condenser has been found to be very effi- 
cient and convenient, and, in laboratories situated 
in the Tropics and provided with an air blast, 
should prove useful for a variety of purposes. 
ERNEST R. Dovey. 
