On this Picostat.com statistics page, you will find information about the cvalues data set which pertains to Historical speed of light measurements. The cvalues data set is found in the gamclass R package. You can load the cvalues data set in R by issuing the following command at the console data("cvalues"). This will load the data into a variable called cvalues. If R says the cvalues data set is not found, you can try installing the package by issuing this command install.packages("gamclass") and then attempt to reload the data. If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the cvalues R data set. The size of this file is about 172 bytes.
Historical speed of light measurements
Measurements made beteween 1675 and 1972
A data frame with 9 observations on the following 3 variables.
Year of measurement
estimated speed in meters per second
measurement error, as estimated by experimenter(s)
http://en.wikipedia.org/wiki/Speed_of_light accessed 2011/12/22
Dataset imported from https://www.r-project.org.