{"product_id":"wwii-u-s-navy-shaft-revolution-indicator-system-bell-code-plaque-dated-march-1943","title":"WWII U.S. Navy Shaft Revolution Indicator System Bell Code Plaque Dated March 1943","description":"\u003cp\u003eOriginal naval propulsion-related display featuring a \u003cstrong\u003eShaft Revolution Indicator System\u003c\/strong\u003e identification plate manufactured by \u003cstrong\u003eThe Electric Tachometer Corporation, Philadelphia, Pennsylvania\u003c\/strong\u003e, dated \u003cstrong\u003eMarch 1943\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eMounted beneath is a \u003cstrong\u003eStandard Bell Code\u003c\/strong\u003e instruction plaque outlining engine room propulsion commands for ahead, stop, back, and full-speed operation based on propeller shaft rotation.\u003c\/p\u003e\n\u003cp\u003eThese systems were used aboard naval and merchant vessels to monitor propeller shaft revolutions and communicate propulsion orders throughout the ship.\u003c\/p\u003e\n\u003cp\u003eA highly decorative and historically significant piece of maritime engineering history with strong World War II and naval appeal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHeight: 10\"\u003c\/li\u003e\n\u003cli\u003eWidth: 8\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003cbr\u003eGood condition with age-related wear, scratches, and oxidation consistent with shipboard use and age. Both metal plates remain mounted to the original display board.\u003c\/p\u003e","brand":"Annapolis Maritime Antiques","offers":[{"title":"Default Title","offer_id":48793716752599,"sku":null,"price":225.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1501\/8628\/files\/image4_2bf5839d-51a6-499f-a005-c21b695e3c63.jpg?v=1781720343","url":"https:\/\/annapolismaritimeantiques.com\/products\/wwii-u-s-navy-shaft-revolution-indicator-system-bell-code-plaque-dated-march-1943","provider":"Annapolis Maritime Antiques","version":"1.0","type":"link"}