46 BULLETIN 105, TJ. S. DEPARTMENT OF AGRICULTURE. 



SUPPLEMENTARY REPORT OF AN EXPERIMENT MADE AT BOWLING 



GREEN, KY., 1907. 



KENTUCKY ROCK ASPHALT. 



The original report of this experiment was published in Circular 

 Xo. 89 and reports of annual inspections are given in Circulars Xos. 

 90, 92, 94, 98, and 99. The inspection on which the following report 

 is based was made on January 5, 1914: 



For a distance of 50 feet from the west end of the section the north 

 half of the road is badly worn and more than 50 per cent of the 

 asphaltic surface is gone. The south half of the road is in fair con- 

 dition. 



In the remaining length of the section there are 33 depressions 

 from 1 to 3 feet in diameter and from 1 to 3 inches in depth, which 

 indicate partial or complete failure of the asphaltic surface. How- 

 ever, as a whole, this portion of the road is in a very fair condition, 

 but it would appear that unless the surface is soon repaired the entire 

 experiment will materially fail within the next year. Disintegration 

 has been quite rapid since a mid-year inspection made on July 8, 

 1913, 



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WASHINGTON : GOVERNMENT TRIXTIXG OFFICE : 1914 



