Crosby steam engine indicator - stunning condition - origional box and papers. An engine indicator is an instrument for graphically recording the pressure versus piston displacement through an engine stroke cycle. Engineers use the resulting diagram to check the design and performance of the engine. Manufactured by Crosby Steam Gage & Valve Co. Of Boston, Massachusetts, this steam engine indicator is enclosed in a wooden case.It consists of a steel piston; an interchangeable external, helical wound spring; a large single recording drum with a spiral spring; and a brass stylus. The piston causes the stylus to rise and fall with pressure changes in the engine under measurement thereby directly recording the indicators output on the paper.
Around the drums base is wound a cord that is attached to the connecting rod of the piston on the steam engine being measured. This causes the drum to rotate as the engines piston moves.The result is a steam pressure-volume diagram which is used to measure the efficiency and other attributes of the steam engine. This indicator differs from other models in that it has provisions for making more than a single pressure-volume diagram. It can use an alternate recording drum that holds a roll of recording paper which is unwound as measurements proceed.
The resulting series of pressure-volume diagrams allow comparison of engine performance over time and as load and other conditions change. The continuous recording mechanism was. The item "Crosby steam engine indicator stunning condition original box and papers" is in sale since Sunday, January 10, 2021.This item is in the category "Antiques\Science/Medicine\Scientific Instruments". The seller is "oldz" and is located in Herne Bay . This item can be shipped to United Kingdom, Antigua and barbuda, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Bahrain, Canada, Brazil, Japan, New Zealand, China, Israel, Hong Kong, Norway, Indonesia, Malaysia, Mexico, Singapore, South Korea, Switzerland, Taiwan, Thailand, Bangladesh, Belize, Bermuda, Bolivia, Barbados, Brunei darussalam, Cayman islands, Dominica, Ecuador, Egypt, Guernsey, Gibraltar, Guadeloupe, Grenada, French guiana, Iceland, Jersey, Jordan, Cambodia, Saint kitts and nevis, Saint lucia, Liechtenstein, Sri lanka, Macao, Monaco, Maldives, Montserrat, Martinique, Nicaragua, Oman, Pakistan, Peru, Paraguay, Reunion, Turks and caicos islands, Aruba, Saudi arabia, South africa, United arab emirates, Ukraine, Chile, Bahamas, Colombia, Costa rica, Dominican republic, Guatemala, Honduras, Jamaica, Kuwait, Panama, Philippines, Qatar, El salvador, Trinidad and tobago, Uruguay, Viet nam.