AND STATICS UNDER THE INFLUENCE OF LIGHT. 
341 
PART I. 
General Arrangements for the Preparation of Pure CL and CO, and 
for Filling the Reaction Vessel. (See Diagram 1.) 
A Topler pump is connected with one arm (1) of the T-tube, and a double¬ 
cylinder Fleuss pump with the second (2), the third (3) carries the manometer (4), 
and is connected with the rest of the apparatus by tube (5). A 3-way tap connects 
either (l) or (2) with (6). 
On the left of the diagram the apparatus for producing pure chlorine is shown. 
Tube (7) containing cupric chloride was heated by one small flame; the chlorine 
formed passes through tube (8) containing phosphorus pentoxide which is connected 
with the reaction vessel whenever it is to be filled with chlorine. Before filling the 
reaction vessel with chlorine, the cupric chloride and phosphorus pentoxide tubes 
were exhausted and heated till a vacuum of , 01 millim. Avas obtained. Chlorine was 
produced by heating the cupric chloride tube, the chlorine then removed, and a 
further supply prepared and directly used for the experiment. 
On the right of the diagram the apparatus for producing pure carbon monoxide is 
shown. Vessel (10) contains sodium formate and concentrated sulphuric acid, vessel 
(9) contains a concentrated solution of potassium hydroxide. When the mercury 
tap (11) is closed, the carbon monoxide formed bubbles through the mercury in 
vessel (12). When the tap is opened it passes through the U-tube (13) containing 
pieces of caustic potash, then through the long tube (14) containing phosphorous 
pentoxide to the receiver (15), which was chosen of a large size so that the gas 
should be as little contaminated with air as possible. This vessel (15) was closed by 
the mercury taps (16), (17) and (6), and was further protected from contamination 
with air by the tube between the taps (16), (6) and (17) being filled with pure 
carbon monoxide. Special precautions were taken to keep the carbon monoxide in 
(15), (14) and (13) pure ; while the carbon monoxide from the tube between (16), (6) 
and (17) was from time to time completely removed by pumping and heating, and 
the tube again filled with pure carbon monoxide from (15). Before filling the glass 
bulb (18) with carbon monoxide, every vessel containing the gas was first evacuated 
to about ‘01 millim., fresh gas was again prepared and immediately used for the 
experiment. 
In the middle of the diagram the reaction vessel (II) is shown, into which carbon 
monoxide and chlorine are brought together for exposure to light. This consists of 
a glass cylinder with ground flanges on which two parallel quartz plates are fixed, 
one in front and the other at the back. A capillary tube (19) connects the 
manometer E with the reaction vessel, and with the tube (20) through which the 
chlorine gas is passed from the cupric chloride tube into the quartz vessel. The 
