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This patent contains the very best description of a water seal trap's role in vapor heating. This is courtesy of Steve Pajek. 

These tests were made during the winters of 1943-44 and 1944-45. The goal was to find a hydronic system that would work well in homes without basements, which were antici...

Bell & Gossett's Air Control Booster Package was a product that never really took off. The circulator removed the air from the system. This brochure is from 1966.

Here is an informational brochure about the Utica Heating system from The Royal Heating Company that appeared in 1938. Thanks to John Mills for scanning it and sharing it...

Thanks to Steve Pajek for finding this patent issued in 1915. Honeywell was not the only company with a heat generator!

This device from the D & T Manufacturing Co. is a strainer, pressure-reducing valve, bypass valve, and relief valve, all combined in one unit. Hot stuff for the time!

A big thanks to Mike Thies for scanning this rare article from Danfoss. There's a heavy emphasis on one-pipe water systems in this one. Great stuff.

This Designing Simplified for Taco Venturi Systems Using Radiators, Convectors, and Baseboard document contains very easy-to-follow instructions on how to size Taco Ventu...

This device, patented in 1905, is similar to the Honeywell Heat Generator. Thanks to Gerry Gill for finding and sharing it. Gerry points out that Lewis Eeggleston went on...

Here is the patent for the Eureka fitting, which is an early diverter tee. Thanks to Gerry Gill for finding and sharing the patent.