306 ILLINOIS STATE DAIRYMEN'S ASSOCIATION 



ways a good demand for good eatable products of any kind, 

 while second-class goods are usually a drag on the market. 



This tank movement seems to have met the approval of all 

 our scientists or dairy educators. (There may be some old fogies 

 who prefer the kerosene barrel or the old stock tank, just tho 

 same as some adhere to cutting grain with a cradle instead of 

 with an up-to-date reaping machine.) And we have every rea- 

 son to believe that within a few years tanks will be used univer- 

 sally. 



We will begin experiments at once with different kinds of 

 metal tanks. That is, we will have a metal tank insulated with 

 two and one-half inches of ground cork, another insulated with 

 two and one-half inches of compressed cork, and a third insulat- 

 ed with a flax material which is composed of three one-half inch 

 layers put up so that there are two dead air spaces, making the 

 insulating material two and one-half inches thick, and it is wrap- 

 ped in rubberoid, making it waterproof. Besides these three 

 tanks, we will also have a vacuum tank. Tests will be made with 

 cream in these tanks and the temperature of the room will be 

 brought up to about loo degrees. The bacteriological and chemi- 

 cal changes will be noted while at this high temperature. In ad- 

 dition to this, the tanks will be subjected to extreme low tem- 

 peratures to investigate winter conditions. Recording ther- 

 mometers will be placed on each tank during the experiments. 



After satisfactory data are secured as regards the tempera- 

 tures, the tanks will be punctured and caused to leak, thus test- 

 ing the effect of moisture on the insulating materials. Then the 

 tank that gives the best results all around will be branded and 

 sold as the ''Official Metal Refrigerator Cream Tank" of the 

 American association. 



These tanks are practically manufactured and sold at cost, 

 and we are in hopes that as many people as possible will try and 

 sell these tanks, because eventually it will mean the raising of the 

 quality of American butter to a standard equal to that of any 

 country. 



