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|Title||Front elevation; sections|
|Date of Creation||18 Feb 1850|
|Description||Inscribed 'From first finished drawings of scheme for Double Boiler made by myself [Joy] Feb-Mar 1850 at 19 Great George Street, Westminster...the idea arose from the demand of Traffic Superintendents to reduce the gross loads when traffic fell off on the collapse of the Railway Mania'.|
|Media||Watercolour and pencil on tracing paper|