May, 1922 



SCIENTIFIC AGRICULTURE. 



315 



THE CUPS USED AND SAIVIFI.ES OE RADIATORS STUDIED. 



Treatment No. 3. Dissolve half a pound 

 of lye in five gallons of water. Put in ra- 

 diator and run engine five minutes. Drain 

 and flush ; repeat several times if neces- 

 sary. 



Treatment No. 4. Dissolve half a pound 

 of washing soda in four gallons of water. 

 Use similarly to lye treatment. 



In applying these treatments to the cups 

 made from the old copper radiators all 

 scale was first removed by the use of sand 

 paper in order that the corrosive effect 

 might be obtained by weighing the cups 

 before and after each treatment. The re- 

 sults of the first series of tests were as 

 follows : — 

 Treatment No. 1 Less of weight 



First five minutes 10.7% 



Second five minutes 0.05% 



Third five minutes 1.6% 



Fourth five minutes 1.9% 



After the fourth treatment the solder 

 was dissolved to such an extent that the 

 eup fell apart. 

 Treatment Xo. 2 : 



This was applied in fourteen hour per- 

 iods and also in seven minute periods. 



Loss of Weight 



First fourteen hours 3.8 % 



Second fourteen hours 1.1 % 



Third fourteen hours 0.60% 



Fourth fourteen hours 0.62% 



First seven minutes 1.2 % 



■Second seven minutes .. .... 0.37% 



Third seven minutes 0.42% 



Fourth seven minutes 0.38% 



The cups were intact after four treat- 

 ments. 



Treatment No. 3. Loss of Weight 



i^ irst five minutes q 527 



Second five minutes .. .. .*.* .' * 029% 



Third five minutes ' o 19^^ 



Fourth five minutes . . . . " " 0I87 

 Treatment No 4. Loss'of Weight 



First five minutes o.05% 



Seeond five minutes ... 67^ 



Third five minutes . . ' * q 077 



Fourth five minutes ;; o.06% 



in all of the above treatments it will be 

 noted that the first treatment caused much 

 grea^er loss of weight than subsequent 

 reatments did. This is due to the fact 

 that the cups were washed clean for the 

 first treatment but after the first treat- 

 ment were covered with the products of 

 corrosion. 



From a study of the above data it will 

 be seen that treatment No. 1 is a very vio- 

 lent one and should not be applied except 

 as a last resort. The succeeding three 

 methods are more iiijoderate in their ac- 

 tion and sliould not damage a well con- 

 structed radiator. 



As a second part of the experiment these 

 cleaning solutions were applied to a se- 

 cond set of cups sealed up by Red River 

 ^Aater. The results are briefly as follows- 



Treatment No. 1 : removed the scale com- 

 pletely in five minutes. 



Treatment No. 2 : removed nearlv all the 

 scale m seven minuses while tim^ recom- 

 mended IS fourteen hours. 



T^'lfment No. 3: applied three times 

 and flushed each time, did not remove anv 

 appreciable amount of the scale, althouo-h 

 It loosened it somewhat. • "" 



