AN APPARATUS FOR DETERMINING SMALL AMOUNTS OF 
CARBON DIOXIDE 
R. C. Wright 
Certain investigations carried on by the Bureau of Markets in connec- 
tion with the storage of fruits and vegetables require a simple and rapid 
method of determining small quantities of carbon dioxide in the air of both 
common and cold storage plants. The Orsat apparatus has been used to 
some extent in this work, but is open to objection because it will not measure 
small enough quantities, and the apparatus is somewhat heavy to carry 
Fig. I. See text for explanation. 
about. Titration methods are, of course, the most accurate, but the neces- 
sary equipment, which is not easily portable, makes these methods practical 
only in what might be termed stationary experiments and where extreme 
accuracy is necessary. 
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