Two steam boiler John Inshaw 1856 Patent pressure gauges

Made:
1856 in Birmingham

2 Pressure Gauges

Two pressure gauges invented by Mr. John Inshaw (1807–1893) in 1856. John was a mechanic and inventor from Birmingham, England who worked with both the rail and shipping industries, and consulted for George Stephenson on wheel designs for steam locomotives.

One of the gauges is probably the experimental instrument with a visible mechanism, whilst the other is a completed and closed in boiler fitting.

Each gauge has two thin discs of sheet metal at the edges that will bulge outwards should any steam or other pressurized fluid admitted enter the space between the discs. Two curved levers communicate motion to the index by means of a rack and pinion, utilizing the bulging of both discs through pressure. The action resembles that of the aneroid barometer, which is stated to have been first constructed by Vidi in 1847.

Details

Category:
Motive Power
Object Number:
1862-111
type:
pressure gauges
credit:
Inshaw, J.

Parts

'Double sensitive' steam engine boiler pressure gauge, John Inshaw 1856 patent

'Double sensitive' steam engine boiler pressure gauge, John Inshaw 1856 patent

Complete 'double sensitive' pressure gauge boiler fitting, invented, patented and made by Mr, J Inshaw in 1856.

Materials:
metal (unknown)
Object Number:
1862-111/1
type:
pressure gauges
Experimental steam engine boiler pressure gauge

Experimental steam engine boiler pressure gauge

Experimental pressure gauge instrument, invented, patented and made by Mr, J Inshaw in 1856.

Materials:
metal (unknown) and glass
Object Number:
1862-111/2
type:
gauges