![Japanese attack on Pearl Harbor. Wrecked USS DOWNES at left and USS CASSIN at right. In the rear is the USS PENNSYLVANIA, 33,100-ton Flagship of the Pacific Fleet, which suffered only light Japanese attack on Pearl Harbor. Wrecked USS DOWNES at left and USS CASSIN at right. In the rear is the USS PENNSYLVANIA, 33,100-ton Flagship of the Pacific Fleet, which suffered only light](https://c8.alamy.com/comp/W66KNK/japanese-attack-on-pearl-harbor-wrecked-uss-downes-at-left-and-uss-cassin-at-right-in-the-rear-is-the-uss-pennsylvania-33100-ton-flagship-of-the-pacific-fleet-which-suffered-only-light-damage-scope-and-content-the-wartime-censor-has-removed-pennsylvanias-cxam-radar-antenna-general-notes-use-war-and-conflict-number-1138-when-ordering-a-reproduction-or-requesting-information-about-this-image-W66KNK.jpg)
Japanese attack on Pearl Harbor. Wrecked USS DOWNES at left and USS CASSIN at right. In the rear is the USS PENNSYLVANIA, 33,100-ton Flagship of the Pacific Fleet, which suffered only light
![Armaments and Innovations - The Launch of Navy Radar | Naval History Magazine - August 2013 Volume 27, Number 4 Armaments and Innovations - The Launch of Navy Radar | Naval History Magazine - August 2013 Volume 27, Number 4](https://www.usni.org/sites/default/files/styles/hero_image/public/magazine_uploads/images/ArmsF1JA13.jpg?itok=y5BvVFIX)
Armaments and Innovations - The Launch of Navy Radar | Naval History Magazine - August 2013 Volume 27, Number 4
![RichShips on Twitter: "Close up: -Forward Mk 38 Main Battery Director -Mk 3 Fire Control Radar mounted on top -Ends of the rangefinder extend out both sides -Rangefinder, Radar, Director turn as RichShips on Twitter: "Close up: -Forward Mk 38 Main Battery Director -Mk 3 Fire Control Radar mounted on top -Ends of the rangefinder extend out both sides -Rangefinder, Radar, Director turn as](https://pbs.twimg.com/media/FN4-pz-XEAEN7cJ.jpg:large)