A Gas tank for the
Hornby Rocket Locomotive. Click
here for details.
Boiler Pressure Regulator.
Forest Classics, sponsors
of Robert Handcock &
Ken Edwards, at the Isle
of Man TT races.
Congratulations to Rob & Ken for winning 5th place at the 2012 Sidecar event!
Visit RJ Road Racing website
Ministeam Atmospheric Engine from 1712
Available as a Ready to Run Model or Kit.
Price: £165.00p Ready to run model
Price: £145.00p Kit
On this working model can be shown the function of the first
atmospheric steam engine. With the heat of the spirit burner some water in
the boiler starts boiling. The steam is blowing off by the check valve so
there is no pressure in the boiler. As soon as a little bit of cold water is
injected into the steam with the spray bottler the steam condenses. A
subpressure is coming up in the cylinder and the boiler. Now the atmosphere
press down the piston and lift up the beam on the other end. The up and down
of the beam operates the water pump connected on a chain deep in the mine.
Ready to run model Lenght: 355 mm
Width: 90 mm
Height: 255 mm
Weight: 395 g
Blacksmith Thomas Newcomen installed the first practical
steam engine in a coal mine in Staffordshire, England in 1712. This was an
atmospheric engine capable of pumping water out of mines at much greater
depth than previously achieved. Former inventions by people such as Dennis
Rapin 1690 and Thomas Savery 1698 were not successful.
The weight of the pump rods raised the piston to the top of its stroke, the
cylinder being filled with steam and then water sprayed into the cylinder to
condense the steam causing a vacuum. The pressure of the atmosphere then
forced the piston down giving the engine its power stroke. On the other end
of the beam was a chain connected to a water pump deep in the mine. The
valves on early engines were operated by hand but this was very inefficient
and the process was soon automated.