[modeleng] Automatic water feed pump

Some years ago there was a short series in ME on an automatic (loco?) boiler 
feed pump.

As far as I recall, it used a piston in a cylinder to "sense" the density of 
fluid at a specific level in the boiler, and if that was water, held the 
actual pumping piston closed, and if not, it allowed it to move thus pumping 
water into the boiler.

I believe it was published in the 70's, possibly earlier.

Can anyone with a better memory than mine, or with better luck at the index, 
let me know who wrote it, or when it was?

http://www.alanstepney.info
Alan Stepney's Model Engineering, steam, and workshop pages. 

MODEL ENGINEERING DISCUSSION LIST.

To UNSUBSCRIBE from this list, send a blank email to, 
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.

Other related posts: