Finding atomic mass?

[Infrasound]

I have always been told that scientists such as Mendeleev used atomic mass to list the known elements of their time. I have always been curious as to how those early scientists actually determined the atomic masses of those known elements. What kind of experiment or process/principle was used?

Thanks in advance!

[read]

From the amount of reagents in chemical reaction one can find the relative masses. Have a look at http://en.wikipedia.org/wiki/Law_of_multiple_proportions