TESTING THE BURNING QUALITY OF TOBACCO. 85 



6 to 8 ram. internal diameter; otherwise the tubes will frequently become 

 clogged b}^ the condensation products of the smoke. The container 

 for the cigar holders {77.) is filled about two- thirds full with dilute sul- 

 phuric acid, which serv^es as an acid wash for the smoke, retaining the 

 organic bases and thereby further helping to prevent the choking up 

 of the machine. The lower ends of all the cigar holders should, of 

 course, extend to exactl}^ the same depth below the surface of the 

 acid. 



In the machine which we now have in operation, the relation between 

 the short arm of the siphon and the internal diameter of the aspirator 

 is such that the volume of water delivered at each emptying of the 

 latter is 600 c.c. This corresponds to an actual capacity of about 450 

 c.c. for the aspirator, the difference, of course, representing the volume 

 of water entering the aspirator from the supply pipe while the siphon 

 is in action. The rate of inflow from the supply tank is approximately 

 900 c. c. per minute. The internal diameter of the long arm of the 

 siphon is 8 mm., while that of the short arm is 25 mm. The entire 

 length of the long arm of the siphon exceeds that of the short arm by 

 40 cm. An apparatus of the above-mentioned dimensions will smoke 

 four cigars of the Perfecto t3^pe, 4f inches in length, in about thirty 

 minutes, a rate which is probably somewhat above that of the average 

 smoker. The pull on the cigar occurs at intervals of thirty seconds 

 and continues for a period of ten seconds. The frequency of the pull 

 is controlled by the rate of inflow of the water from the supply tank, 

 while its duration is governed principally b}^ the relation between the 

 diameter of the small arm of the siphon and the volume of the 

 aspirator. 



THE EFFECTS OF THE FILLER, THE BINDER, AND THE WRAPPER 

 ON THE BURN OF THE CIGAR. 



As preliminary to the use of the cigar test in examining wrapper 

 leaf, a series of experiments was carried out to determine the relative 

 effects of the three components of the cigar on the burn. For this 

 purpose a number of cigars were made b}" an expert workman, using 

 four different t3qDes of wrapper on each of four different types of 

 filler. In a portion of the cigars the binder used was taken from the 

 same leaf as the wrapper, while in the remainder a sample of Connecti- 

 cut Broadleaf tobacco was emplo3"ed for this purpose. These cigars 

 were smoked in the above-described apparatus under conditions as 

 nearly uniform as could be obtained, and the evenness of the burn and 

 the character of the ash were carefull}^ noted. 



With reference to the evenness of the burn, markedly different 



results were obtained when wrappers taken from the same sample were 



smoked on different types of filler. A typical case of this kind is shown 



in Plate III. The twelve cigars shown were all made from the same 



100-iv 



