The first day of the experiment the equipment was not operating according to the lab manual, and therefore we spent the day troubleshooting the CRT and voltage supplies.
Here is a link to a diagram of the CRT
A write-up of the initial troubleshooting methodology: Physics307L:People/Gleicher/Notebook/070910
After Bill Miller discovered that an extra voltage was required on the CRT (5-12 Volts in parallel with heater voltage), we proceeded to take data Physics307L:People/Gleicher/Notebook/070917.
Using Bragg's Law: 2*a*sin*theta=m*lambda
Here is a link to the Excel sheet with my calculations Media:Data electron diff junior.xls
The values I calculated averaged to 1.99E-10 and 1.15E-10.