The data below is the wool data set.
It comes from an experiment concerning the number of cycles to failure of
lengths of worsted yarn under cycles of repeated loading. The factors are

length of test specimen
amplitude of loading cycle
load

length	amp	load	cycles
250	8	40	674	
250	8	45	370	
250	8	50	292	
250	9	40	338	
250	9	45	266	
250	9	50	210	
250	10	40	170	
250	10	45	118	
250	10	50	90	
300	8	40	1414    
300	8	45	1198	
300	8	50	634	
300	9	40	1022	
300	9	45	620	
300	9	50	438	
300	10	40	442	
300	10	45	332	
300	10	50	220	
350	8	40	3636	
350	8	45	3184	
350	8	50	2000	
350	9	40	1568	
350	9	45	1070	
350	9	50	556	
350	10	40	1140	
350	10	45	884	
350	10	50	360