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What is a Level?By Chris McNickle
What is a Dumpy or Automatic Level
Let us look at the history of surveying levels. Since the Dumpy level was invented in early 1700’s it has been considered the standard, that was up until around the 1830’s when the transit level was invented. Recently the level has changed faster than [...]

The Shuttle Orbiters - How They Were NamedBy Leon Steyn
On April 10, 1981 a crowd of more than 600 000 spectators crowded the beaches and causeways around the Kennedy Space Center. They all came to see the launch of the first shuttle mission. Many could see the Columbia poised on the pad before it was [...]

Star Testing - Ensuring the Quality of Telescope OpticsBy Zavier Fong
To ensure the quality of telescope optics, a very sensitive technique known as star testing is performed. Albeit an easy technique, correct interpretations of the results require careful examination and sufficient knowledge. Specifically, optical aberrations (oftentimes caused by imperfect optical systems or bad weather conditions) [...]