{"product_id":"american-railway-signaling-principles-and-practices-alternating-current-relays-x","title":"American Railway Signaling Principles and Practices Alternating Current Relays X","description":"\u003cbody\u003e\n\u003c!-- HTML Generated by Auction Wizard 2000 - http:\/\/www.AuctionWizard2000.com\/ --\u003e\n\n\n   \u003cmeta charset=\"UTF-8\"\u003e\n   \u003cmeta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\"\u003e\n\n\n\u003c!-- AW2KLOT#:198113 --\u003e\n\u003cbr\u003e\n\u003ctable style=\"width:98%;padding:2px;margin:auto;border:5px outset #673434;background-color:#FDF3D0\"\u003e\u003ctr\u003e\u003ctd style=\"border:1px inset #673434;margin:5px;\"\u003e\n\u003ctable style=\"width:100%;border:0px;padding:5px;\"\u003e\n\u003ctr\u003e\u003ctd\u003e\n\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd style=\"padding:5px\"\u003e\n\u003cdiv style=\"text-align:center\"\u003e\n\u003cspan style=\"font-family:Arial Black;font-size:1.5em;color:#000000;font-weight:normal;font-style:normal;text-decoration: underline;\"\u003eRailroadTreasures\u003c\/span\u003e\u003cspan style=\"font-family:Arial Black;font-size:1.5em;color:#000000;font-weight:normal;font-style:normal;text-decoration: underline;\"\u003e \u003c\/span\u003e\u003cspan style=\"font-family:Arial Black;font-size:1.5em;color:#000000;font-weight:normal;font-style:normal;text-decoration: underline;\"\u003eoffers the following item:\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align:left\"\u003e\u003cspan style=\"font-family:Times New Roman;font-size:1.0em;color:#000000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003e  \u003c\/span\u003e\u003c\/div\u003e\n\n\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd style=\";padding:5px\"\u003e\n\u003cdiv style=\"text-align:center\"\u003e\u003cspan style=\"font-family:Arial;font-size:1.13em;color:#000000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003eAmerican Railway Signaling Principles and Practices Alternating Current Relays X\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:center\"\u003e\u003cspan style=\"font-family:Arial;font-size:1.13em;color:#000000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003e  \u003c\/span\u003e\u003c\/div\u003e\n\n\u003cdiv style=\"text-align:left\"\u003e\u003cspan style=\"font-family:Calibri;font-size:1.13em;color:#000000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003eAmerican Railway Signaling Principles and Practices Alternating Current Relays \u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:left\"\u003e\u003cspan style=\"font-family:Calibri;font-size:1.13em;color:#000000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003eChapter 10  \u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:left\"\u003e\u003cspan style=\"font-family:Calibri;font-size:1.13em;color:#000000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003eCopyright 1927     \u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:left\"\u003e\u003cspan style=\"font-family:Calibri;font-size:1.13em;color:#000000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003eApprox 56 pages\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:left\"\u003e\u003cspan style=\"font-family:Calibri;font-size:1.13em;color:#000000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003eThe alternating current relay performs the same function as the direct current relay, i.e., both types are provided with certain contacts to open or close circuits as desired, depending on whether these circuits are to be opened or closed when the relay is de-energized or energized as the case may be; in the alternating current relay, however, its motor mechanism or device which actuates the contacts is especially designed to operate on alternating current, while in the direct current relay this device, of course, is designed to operate on direct current. The entire mechanism of the alternating current relay, including windings, cores, armature and contact, is enclosed in a substantial case with exterior binding posts and glass sides to permit inspection. All cores of alternating current relays are laminated, being formed of thin painted sheets of steel stampings to prevent loss of power due to heating by eddy currents that would be generated to an undue extent by the alternating magnetic flux, if the core were solid as in direct current relays. The armature vane or rotor is the chief movable part of the relay, inasmuch as it furnishes the mechanical power to operate the contacts. A winding of a relay is the coiled conductor, which receives its energy from the outside source to make the relay function. A winding may be one coil or two or more coils wired in series or multiple. Nearly all relays are operated on the induction principle and are used either for track or line work, depending upon the source of control energy. The alternating current relay is either a single or two-element relay, depending upon the number of external control circuits. The two-element relay is sometimes called double-element relay or polyphase relay. It always has two windings and can be converted into a single-element relay by means of resistors or reactors used in connection with one of the windings. One of the windings in a two-element relay is connected to a constant local power source and called the \"local\" element ; it is usually wound for 15, 55 or 110 volts. The other winding is connected either to the track or line control, and is called the \"control\" element ; the control element is usually referred to as the track or line element.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:left\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\n\u003cdiv style=\"text-align:left\"\u003e\u003cspan style=\"font-family:Arial;font-size:1.0em;color:#000000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003eAll pictures are of the actual item.  There may be reflection from the lights in some photos.   We try to take photos of any damage.    If this is a railroad item, this material is obsolete and no longer in use by the railroad.  Please email with questions. Publishers of Train Shed Cyclopedias and Stephans Railroad Directories. Large inventory of railroad books and magazines. Thank you for buying from us.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:left\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:center\"\u003e\u003cspan style=\"font-family:Arial;font-size:1.13em;color:#CE0000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003eShipping charges\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:left\"\u003e\u003cspan style=\"font-family:Arial;font-size:1.0em;color:#000000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003eUS Shipments:  When you add multiple items to your cart, the reduced shipping charges will automatically be calculated.   For direct postage rates to other countries, send me an email.   Shipping varies by weight.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:left\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:center\"\u003e\u003cspan style=\"font-family:Arial;font-size:1.13em;color:#CE0000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003eTerms and conditions \u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:left\"\u003e\u003cspan style=\"font-family:Arial;font-size:1.0em;color:#000000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003eAll sales are final. Returns accepted if item is not as described.  Contact us before making a return.  No warranty is stated or implied. Please e-mail us with any questions before bidding or buying.   \u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:center\"\u003e\u003cspan style=\"font-family:Arial;font-size:1.5em;color:#000000;font-weight:normal;font-style:normal;text-decoration:none;\"\u003eThanks for looking at our items.   \u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align:left\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\n\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd style=\";padding:5px\"\u003e\n\u003cdiv style=\"text-align:center;width:99.9%;margin:auto\"\u003e\n\n\u003c\/div\u003e\n\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\u003c\/tr\u003e\u003c\/table\u003e\n\n\u003c\/body\u003e","brand":"RailroadTreasures","offers":[{"title":"Default Title","offer_id":45091849208004,"sku":"EB-396916984390","price":30.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2232\/7333\/files\/57_d9b957b4-6175-4198-be5a-280aa2b63936.jpg?v=1755031010","url":"https:\/\/railroadtreasures.com\/products\/american-railway-signaling-principles-and-practices-alternating-current-relays-x","provider":"RailroadTreasures","version":"1.0","type":"link"}