File:Anti-aircraft guns, and fire directors, on the USS Chicago, taken at Mare Island in 1931.png

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Description Original caption: "
The medium-calibre long-range anti-aircraft fire-control systems used in the Second World War can all be traced back to those of the inter-war years. Because very little money was available in the 1930s, the key issue was whether earlier, unsatisfactory, systems could be the basis for step-by-step development into something effective...
"
Date Template:Circe
Source Page 21 of Naval Anti-Aircraft Guns & Gunnery - Norman Friedman
Author USN
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This file is a work of a sailor or employee of the U.S. Navy, taken or made as part of that person's official duties. As a work of the U.S. federal government, it is in the public domain in the United States.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

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current00:26, 6 January 2021Thumbnail for version as of 00:26, 6 January 2021800 × 834 (288 KB)Geo Swan (talk | contribs)Cropped 35 % vertically using CropTool with precise mode.
00:26, 6 January 2021Thumbnail for version as of 00:26, 6 January 2021800 × 1,280 (464 KB)Geo Swan (talk | contribs){{Information |Description={{original caption|The medium-calibre long-range anti-aircraft fire-control systems used in the Second World War can all be traced back to those of the inter-war years. Because very little money was available in the 1930s, the key issue was whether earlier, unsatisfactory, systems could be the basis for step-by-step development into something effective...}} |Source=Page 21 of [https://books.google.ca/books?id=deqZBgAAQBAJ&printsec=frontcover&dq=%22naval+anti-aircra...

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