Laxey, Isle of Man - Wheel - Dennis postcard, nice local pmk 1919

Postcard
• Picture / Image:  Laxey Wheel, Isle of Man
• Publisher: ETW Dennis 
• Postally used: yes
• Stamp:  George V 1d red
• Postmark(s): Laxey 1919 thimble type cds
• Sent to:  Miss Jeannie Quick, co Mr James Fowles, Fernleigh Villas, High Street, Winsford, Cheshire 
• Notes / condition: 

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Text from the free encyclopedia WIKIPEDIA may appear below to give a little background information (internal links may not  work) :

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The Laxey Wheel (also known as Lady Isabella) is built into the hillside above the village of Laxey in the Isle of Man. It is the largest working waterwheel in the world.[1] Designed by Robert Casement, the wheel has a 72-foot-6-inch (22.1 m) diameter, is 6 feet (1.8 m) wide and revolves at approximately three revolutions per minute.

It was built in 1854 to pump away water from the Glen Mooar part of the Great Laxey Mines industrial complex. It was named "Lady Isabella" after the wife of Lieutenant Governor Charles Hope, who was the island's governor at that time.

The wheel is currently maintained by Manx National Heritage as part of the Great Laxey Wheel & Mines Trail.

The wheel features today on the reverse side of the £20 notes issued by the Isle of Man Government.[2]

Technical details

A water-powered wheel was used because the Isle of Man does not have a supply of coal for a steam-powered pump.

Water from the surrounding area – including a number of local springs and streams – is collected in a cistern, which is above the level of the top of the wheel. A closed pipe connects the cistern to the top of the wheel; thus the water flows up the tower as an inverted syphon. The water falls from the pipe into the buckets (formed from wooden slats on the circumference) and makes the wheel rotate in what is described as the 'reverse' direction: it is a pitchback wheel. The crank has a throw of 4 feet (1.2 m) and connects to a counterweight and to a very long rod. This rod runs along the rod viaduct to the pumping shaft where the 8 feet (2.4 m) stroke is converted by a T-rocker into a pumping action.

Most of the wheel and rod is made of wood; however, key mechanical parts are metal to provide tension and bearing surfaces. The rod has attached wheels at intervals to permit the stroke's motion with minimal friction.