We had to conduct a similar practice to Millikan's oil drop experiment in class. This is the situation: There are 10 bags each containing a different amount of small marbles of the same mass. There is also one big marble of different mass to the small marble added to each bag. Each bag is massed and that mass is given to us. Now through techniques similar to those of Millikan, we must: 1. Determine the mass of one SMALL marble. 2. Determine the number of SMALL marbles in each bag. Our technique was simply to find the difference between all the bags and thus having 45 differences. This difference represents the net mass. That is, since all the bags contain one large marble, this difference eliminates the mass of the large marble as well as the bag since they were constants of each total mass. This leaves the net mass of just the small marbles in each bag. Moreover the smallest difference between the differences were found. If this difference was divisible into all the other differences as a whole number factor, it was concluded that this was the mass of a single small marble. Now how do we find the number of small marbles in each bag? We don't have either the mass of one big marble nor the mass of the bag. I know there are some serious flaws with this method so feel free suggesting a more sound, error-proof method that may involve mathematical equations and more physics concepts. Thanks.