{"product_id":"historic-photo-new-york-haven-hartford-railroad-cos-cob-power-v3","title":"Historic Photo : New York, New Haven \u0026 Hartford Railroad, Cos Cob Power Plant, Sound Shore Drive, Greenwich, Fairfield County, CT 7 Photograph","description":"\u003cp\u003e48. VIEW LOOKING NORTHEAST AT EXCITER RESISTANCE GRIDS LOCATED UNDER THE CONTROL ROOM ON SOUTH SIDE OF TURBINE HALL. THE GRIDS WERE AN ESSENTIAL PART OF THE CONTROL SYSTEM THAT MAINTAINED CONSTANT VOLTAGE ON THE RAILROAD POWER LINES. TIRRILL VOLTAGE REGULATORS (SEE CT-142A-100) SENSED VOLTAGE VARIATIONS AND INITIATED SWITCHING SEQUENCES TO REGULATE THE VOLTAGE AND MAINTAIN A SYSTEM STANDARD VOLTAGE. THE RESISTANCE GRIDS WERE SEQUENTIALLY ADDED TO OR REMOVED FROM THE GENERATOR FIELD COIL CIRCUITS. THIS RESISTANCE LOAD DISSIPATED EXCITIR GENERATOR POWER AS HEAT. THIS IN TURN WOULD VARY THE STRENGTH OF THE FIELD MAGNET AND CONSEQUENTLY RAISE OR LOWER THE OUTPUT VOLTAGE FROM THE MAIN GENERATOR ARMATURE. - New York, New Haven \u0026amp; Hartford Railroad, Cos Cob Power Plant, Sound Shore Drive, Greenwich, Fairfield County, CT\u003c\/p\u003e","brand":"Historic Pictoric","offers":[{"title":"12in x 08in","offer_id":44909337477283,"sku":"3001387_1208__PH02","price":24.99,"currency_code":"USD","in_stock":true},{"title":"24in x 16in","offer_id":44909337575587,"sku":"3001387_2416__PH02","price":49.99,"currency_code":"USD","in_stock":true},{"title":"36in x 24in","offer_id":44909337673891,"sku":"3001387_3624__PH02","price":59.99,"currency_code":"USD","in_stock":true},{"title":"44in x 30in","offer_id":44909337772195,"sku":"3001387_4430__PH02","price":99.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0414\/5437\/0979\/products\/367747.jpg?v=1683482481","url":"https:\/\/historicpictoric.com\/products\/historic-photo-new-york-haven-hartford-railroad-cos-cob-power-v3","provider":"Historic Pictoric","version":"1.0","type":"link"}