THE MARKING OF TENTS. 



55 



boy, furnishing a sort of rest when the hitter is tipped to remove the 

 acid. It is well to scoop out a small pit below this ridge of dirt, into 

 which the vessel receiving the acid may be lowered when the acid is 

 so largely removed that it is necessary to turn the carboy far on its 

 side in order that all may be withdrawn. 



In figure 19 the handles on the carboy are substitutes for the heap 

 of dirt and the pit. They are also of service in carrying the carboy. 



THE PROTECTION OF 

 CYANID. 



Many fumigators do 

 not attempt to cover 

 their cases of cyanid, 

 but leave them open 

 during the day. This 

 not only constitutes a 

 source of danger to 

 various animals, but 

 also during the wet 

 season allows water to 

 reach the cyanid-. Fig- 

 ure 20 shows a simple 

 lid covered with zinc 

 which is suitable for 

 placing on a cyanid 

 case to protect its con- 

 tents. 



HYDROCYANIC-ACID 

 GAS IN DRUMS. 



Some discussion has 

 arisen during the past 

 year relative to the 

 possibility of introduc- 

 ing hydrocyanic-acid 



Fig. 18.- 



-Carboy resting against a heap of dirt to facilitate pouring 

 the acid. (Original.) 



gas into drums under pressure, and using it 

 directly from the drums, thus doing away with all generation in the 

 field. The use of this gas imder pressure from drums is impossible 

 at the present time for two reasons: (1) Xo drums are made which 

 will hold hydrocyanic-acid gas without corroding; (2) we kno^r of no 

 instrument which will measure gas accurately under varying degrees 

 of pressure, such as would exist in removing a gas under pressure from 

 drums. 



THE MARKING OF TENTS. 



Before new tents are marked they should have been m use for a 

 short time, so that they will be thoroughly shrunken. This shrinking 



