An image showing 'N26674; A study of a 2½ inch S.D. valve and a 2½ inch diaphragm valve photographed against a plywood backboard in Portsmouth Dockyard, viewed from the front. The valve on the right has "Tested to 100 lbs B?O 11/8/32" stamped into the flange and "983 P171A P17" cast into the body.'

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2½ inch S.D. and diaphragm valves in Portsmouth Dockyard, Hampshire.

A study of a 2½ inch S.D. valve and a 2½ inch diaphragm valve photographed against a plywood backboard in Portsmouth Dockyard, viewed from the front. The valve on the right has "Tested to 100 lbs BɅO 11/8/32" stamped into the flange and "983 P171A P17" cast into the body.

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Object details

ID:	N26674
Type:	Negative
Materials:	Glass plate negative
Display location:	Not on display
Date made:	31 May 1948
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 120 mm x 164 mm