Ready References
Signal Conditioning and Data Acquisition Basics
Overview of Motion Control
Understanding Celestial Coordinates
Laboratory Optical Work
Age of the Earth
AAVSO Membership Information
Electrometers and Electroscopes
Ready References 
Signal Conditioning and Data Acquisition Basics Overview of Motion Control Understanding Celestial Coordinates 
Laboratory Optical Work Age of the Earth AAVSO Membership Information Electrometers and Electroscopes