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The article discusses the work of 19th-century astronomers James Nasmyth and James Carpenter, who created highly accurate plaster models of the Moon despite having incorrect ideas about how lunar craters formed. They proposed a volcanic theory of crater formation, suggesting that the Moon's surface contracted as it cooled and shrank. While their theories were later proven inaccurate, Nasmyth and Carpenter's innovative illustrations and models provided valuable insights into the Moon's topography and were ahead of their time. [Extracted from the article]

The article offers information on planetary imaging by Lowell Observatory, which was established by Percival Lowell in 1895, through its centerpiece the legendary 24-inch Clark refractor. Topics discussed include many scientific discoveries done by the observatory and its great refractor, major advances in optics and related instrumentation which extended astronomy and application of photography to study the planets.

Suggests ways to enhance planetary photos. Duplicating slides; Enhancing sketches of planets; Requirements for successful planetary photography; Ingredients of slide duplication; Converting negatives to positives; How to obtain a high-contrast result; How to use a new approach of visual imaging; Standardizing the procedure; More.