Simon Newcomb measured the time (in millionths of a second) required for light 
to travel from his laboratory 
on the Potomac River to a mirror at the base of the Washington Monument and back, 
a total distance of about 7400 meters. These measurements were used to estimate the 
speed of light. The datafile contains the estimated speed of light for 66 trials. 

Reference: Moore, David S., and George P. McCabe (1989). 
Introduction to the Practice of Statistics. 
Original source: Stigler, S.M., "Do robust estimators work with real data?" 
Annals of Statistics, 5 (1977), pp. 1055-1078.