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Nathan Manufacturing, Inc. is a division of Micro Precision Group which makes Airchime, Ltd. train horns for North America. It is one of two major train horn manufacturers in the United States, Leslie Controls, Inc. being the other. Nathan horn manifolds are "stout and solid-looking", while Leslie's are "open and lacy." ==Products== The K-series Airchime horn is sold to manufacturers of locomotives and to fleet operators. *The K-1 single tone horn includes a die-cast aluminum bell and has frequencies ranging from 261 hertz to 660 hertz. *The K-3L-CDF three-chime assembly includes three die-cast aluminum bells with the same frequency ranges, and they may be reversed. A shield to protect from snow and other debris may be included.〔(【引用サイトリンク】title=Model K – Locomotive Air Horns )〕 The original K3L was sand-cast, made by Holden Ltd. of Canada.〔(【引用サイトリンク】title=Choosing the Right Sound System )〕 *The K5LA five-chime assembly has five bells whose musical chord helps the horn to be heard and lessens complaints. The bells may be reversed〔 for trains that go backwards and help those working at the back of the train hear the horn on the front. The K5LA is the most popular horn in use today, with a B major 6th chord (D-sharp, F-sharp, G-sharp, B, D-sharp).〔 Though first used by Chessie System,〔 it was developed for Amtrak as a variation on the original K horn, and is the standard horn for Amtrak, CSX, Norfolk Southern,〔(【引用サイトリンク】title=AirChime K5LA )〕 and Illinois Central as well as commuter and passenger trains.〔(【引用サイトリンク】title=Nathan/Airchime K5 series )〕 Nathan also makes P-series and M-series horns for railroads and CS-Series and KJ-series horns, KSV vertical mount horns, steam whistles, heated horn assemblies, electronic pressure regulators, control valves, flange lubricators and glo rod gauges.〔(【引用サイトリンク】title=Nathan Manufacturing Inc. )〕 P-series horns also include single tone (P1), three-chime (P3) and five-chime (P5) versions. The bells are sand-cast. Frequency ranges may be from 220 to 554 hertz.〔(【引用サイトリンク】title=Model P – Locomotive Air Horns )〕 The P-series horns have longer bells and a heavier manifold than the M-series.〔 The name of the horn is a P followed by the bells that face forward, followed by R if any are reversed, and then the numbers of the reversed bells; a P12345 is a true five-chime horn with all bells facing forward, while P135R24 has bells 2 and 4 reversed.〔(【引用サイトリンク】title=Nathan P5 )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nathan Manufacturing」の詳細全文を読む スポンサード リンク
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