480 SUMMARY OF CURRENT RESEARCHES RELATING 10 
enters through the upper lateral tube. If it is desired to diminish the 
inflow of gas, this can be done by turning B. The gas passes through 
(1) into the inner space and leaves at (2). The gas goes down, and a 
portion leaves through the minimum supply opening (4), while the re- 
mainder passes down through (5) and out of (3). By turning C the 
minimum outflow of gas can be regulated at will. The regulator works 
exceedingly well, especially in connection with Murrill’s gas pressure 
regulator. 
New Gas-Pressure Regulator.* — Mr. P. Murrill has invented a gas- 
pressure regulator, the strong points of which are efficiency, simplicity, 
durability, and cheapness. The outer vessel or pail is 6 in. (15 cm.) in 
Fig. 88. Fig. 89. 
Fig. 90. 
diameter and 7 in. (18 cm.) deep. Through the centre of the bottom 
three tubes enter, rising 5£ in. (14*5 cm.) above the bottom. The 
direction and arrangement of these tubes is shown in the illustrations. 
The inlet tube (fig. 89, A) is fitted with 
a stopcock to which a 4-in. (10 cm.) 
lever arm is attached. On the inside 
of the pail are soldered three vertical 
U-shaped grooves extending 3 in. (8 cm.) 
above the top. The inner vessel or float 
is 5 in. (13 cm.) in diameter and 6 in. 
(15 cm.) deep. On the outside are 
soldered three vertical flanges, corre- 
sponding to the three grooves in the 
outer vessel. To the top of the float 
is soldered a stiff wire ring, and this is 
connected with the lever arm by a wire 
of such length that the valve is wide 
open when the float is at its lowest position. The float with attachments 
should weigh about 25 oz. (700 grm.), under which weight the gas will 
be delivered at about 40 mm. pressure ; but by means of weights placed 
PLAN- TOP OF INNER 
a PAIL REMOVED 
Journ. Applied Microscopy, i. (1898) pp. 92-1 (4 figs.). 
