Ready References
Essential Technologies for Making Accurate PC-Based Measurements
Latitude is Everything
Fields of Gravitation
Variable Stars Explained
Keeping Warm at the Telescope
Electrometers and Electroscopes
Ready References Essential Technologies for Making Accurate PC-Based Measurements Latitude is Everything Fields of Gravitation Variable Stars Explained Keeping Warm at the Telescope 
Electrometers and Electroscopes Latitude is Everything