Ericsson Hot Air Pump (from Internet Glossary of Pumps)
Ericsson Hot Air Pump
This pump was designed in the 1800's by John Ericsson, designer of the Civil War battleship Monitor.

The Ericsson Hot Air Pump had many advantages for rural customers: It was reliable, ran on virtually any fuel, had easily replaced parts, and could not explode. (No steam is used, only a few cubic feet of hot air.)

A fascinating series of linkages sequences all the events. The pump works by continuously heating and cooling the same air. The heated air expands and pushes up the TRANSFER PISTON (shaded gray here).

The air is transferred around the edges of Transfer Piston to the space between the top of the transfer piston and the AIR PISTON. Water circulating around the cylinder cools the air, causing it to contract.

The water that cools the air was just brought up from the well. It exits via the outlet pipe (behind, not shown.) The Air Piston pushes the cooled, contracted air down past the Transfer Piston and the cycle repeats.

(This is an 18-frame animation, converted to animated GIF format and then super-compressed for Internet transmission. (Note: On some Internet browsers it may be displayed much less smoothly than the CD-ROM version, where the frames are timed to a thousandth of a second, are larger, and there are twice as many frames (36).))

FTP Downloadable Software! Download an animation of this pump! The Ericsson Hot Air Pump animation requires 1 meg of SVGA video (VESA 1.2 or higher) and at least 4 megabytes of free EMM or XMS RAM. It consists of 36 frames. Timing accuracy better than 1/1000th of a second! You can slow it down and speed it up in fine increments to run it at the perfect speed for you to enjoy!

Go to web page describing Statistics Explained

CD-ROM -- only $59.95!

  • This Glossary is a part of a complete educational tutorial about pumps!
  • Mechanical pumps are the second most common machine in the world (after electric motors).
  • Most people are unfamiliar with how the many different kinds of pumps work!
  • Call us toll free to order the program on CD-ROM! Satisfaction Guaranteed!

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Last modified February, 2002
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