Historical information

This crucible was raised from the wreck of the LOCH ARD. It is one of six similar relics, in a range of sizes, now in the Flagstaff Hill collection. All bear markings to indicate their manufacture by the Morgan brothers of Battersea, trading as the Patent Plumbago Crucible Co.
A crucible is a container used for purifying and melting metals so that they can be cast in a mould to a predetermined shape and use. They must withstand extremely high temperatures, abrupt cooling, and shed their contents with minimal adherence. The addition of graphite to the traditional firing clays greatly enhanced the durability of industrial crucibles in mid-Victorian Britain, a significant technological advance at a time of great activity and expansion in foundries and demand for refined metals.
The Morgans first noticed the advantages of graphite crucibles at the Great Exhibition held in London in 1851. Initially they contracted to be sole selling agents for the American-made products of Joseph Dixon and Co. from New Jersey, but in 1856 they obtained that firm’s manufacturing rights and began producing their own graphite crucibles from the South London site.
The Morgans imported crystalline graphite in 4-5 cwt casks from the British colony of Ceylon (now Sri Lanka) and mixed it with conventional English (Stourbridge) clays to be fired in kilns. Their products were purchased by the Royal Mints in London and India, and exported to official mints in France and Germany. They were successful exhibitors of their crucibles and furnaces at the London Exhibition held in 1861 (Class 1, Mining, quarrying, metallurgy and mineral products, Exhibit 265, Patent Plumbago Crucible Co).
The range of sizes represented by the six crucibles retrieved from the LOCH ARD, suggest they may have been part of a sample shipment intended for similar promotion in the Australian colonies ― at Melbourne’s International Exhibition to be held in 1880. A summary of the LOCH ARD cargo manifest, by Don Charlwood in ‘Wrecks and Reputations’ does not mention any crucibles, implying that they were not part of a larger consignment of uniform items.
A newspaper account of an 1864 tour of the Morgan brothers’ ‘Black Potteries’ at Battersea indicates: “All the pots were numbered according to their contents, each number standing for one kilogram, or a little over two pounds; a No. 2 crucible contains two kilogrammes; a No. 3, three kilogrammes, and so on.” These numbers are obscured by marine sediment on three of the crucibles in the Flagstaff Hill collection, but those legible on the remaining three are 5, 6, and 8. None of the six are of the same size from a visual appraisal.

Significance

The shipwreck of the LOCH ARD is of State significance ― Victorian Heritage Register S417

Physical description

A No. 6 size Morgan’s graphite crucible (i.e. 6kgs capacity). The crucible rises in a slight curve from a smaller flat base up to a wider top with a (chipped) pouring lip. It was recovered from the wreck of the LOCH ARD. The artefact is largely accretion free despite its long period of submersion at the wreck site. It has a number of visible maker’s markings which identify the manufacturer and the smelting capacity of the pot. The graphite crucible is in fair and stable condition.

Inscriptions & markings

The number “6” which is framed in a square. The letters “THE PATENT PLUMBAGO CRUCIBLE COMPANY” and “BATTERSEA WORKS COMPANY”. Below rim "... GNS"