THE IRRIGATION AGE. 



299 



machine onto them along heavy bridge timbers. By 

 an ingenious arrangement he balanced the vessels 

 so that the great weight was equally divided be- 

 tween the two, and towed by a steamer, the strange 

 vessel, with its stranger freight, steered across and 

 along the river. The bulky machine crawled once 

 more onto terra firma, and the transportation was 

 complete. Mr. Mclntosh believes this is one of the 

 biggest undertakings of its kind ever handled in any 

 part of the world. The transportation cost less than 

 50, and Mr. Mclntosh says he can take the exca- 

 vator anywhere he likes along the Murray. 



dence suggests that this always be done before 

 going into any unventilated pit or mine where the 

 decay of vegetation may have generated carbonic 

 acid. 



The pit silo may be made safe by proper precau- 

 tions, but will everyone who uses it always have the 

 forethought to take those precautions? "Safety 

 First" suggests that pit silos be built only in the 

 sides of banks, where they may have an opening 

 clear to the bottom. M. B. 



DANGER OF THE PIT SILO 



Editor IRRIGATION AGE: I think Mr. Larsen 

 should have pointed out in his excellent article on 

 the pit silo, in your June number, the danger that is 

 likely to be met with in its use. A silo should be so 

 built that it is always ventilated to a point nearly 

 opposite the top of its contents. This allows the car- 

 bonic acid gas, or carbon dioxide, to flow off with- 

 out doing harm. If built in the side of a bank, a 

 pit silo might be so ventilated. The carbonic acid, 

 being heavier than air, lies in the silo if means for 

 its escape are not provided. 



The pit silo is one of the earliest forms, but 

 lives were lost by reason of the accumulation of 

 carbonic acid, and it is probable that in this fact we 

 may have the chief reason for its abandonment. The 

 presence of carbonic acid may be detected by lower- 

 ing a lighted candle into the silo, and common pru- 



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