Classifier Instance:

Anchor text: United States
Target Entity: United_States
Preceding Context: In the
Succeeding Context: in the early 1920s articles in Popular Astronomy by Russell W. Porter and in Scientific American by Albert G. Ingalls featuring Porter and the Springfield Telescope Makers helped expand interest in the hobby. There was so much public interest Ingalls began a regular column for Scientific American on the subject (spawning that publications The Amateur Scientist column) and later compiled into three books titled Amateur Telescope Making Vol. 1-3. These had a large readership of enthusiast (sometimes called "telescope nuts") constructing their own instruments. Between 1933 and 1990, Sky and Telescope magazine ran a regular column called "Gleanings for ATMs" edited by Earle Brown, Robert E. Cox & Roger Sinnott. The ready supply of surplus optical components after World War 2 and later Sputnik and the also greatly expanded the hobby.
Paragraph Title: Beginnings
Source Page: Amateur telescope making

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