The portrait bust, designed for interior display, also became popular. By the middle of the century were being preferred to painted portraits among the aristocracy. As in England, commissions of new statuary tended to in relatively cheap lead and even more economical painted or gilded plaster. The plasterwork of John Cheere's yard in London was particularly in demand. Also important was the work from the yard of John Bacon (1740–99) who produced a monument for Robert Dundas (d. 1787) at Borthwick Church and one for Mrs Allardyce (d. 1787) at West Church, Aberdeen. Bacon was also a partner in Mrs Eleanor Coade's "Artificial Stone Manufactory" at Lambeth in London. This produced a buff coloured ceramic that could be moulded to provide fine detail, and be fired in sections, but was impervious to frost and fire. Much cheaper than carved stone, Coadstone was used for sphinxes, balustrading, capitals, coat of arms, tablets, ornamental vases, church monuments and fonts. It was used extensively by the Adam brothers, particularly in the houses they built in Scotland, such as Cullen, Banff, Culzean Castle, Ayrshire, Dunbar Castle, East Lothian, Register House, Edinburgh, Gosford House, East Lothian and Wedderburn, Berwickshire. As well as supplying sculpture, candelabra and cippi, the Adam family supplied designs to the Carron Company, founded in 1759, which produced a wide range of iron products, including stoves, safes, vases and tablets. From the late eighteenth century there are a handful of examples of work from Scottish artists. These included statues of druids on the portico of Penicuik House carved by one "Willie Jeans" in 1776; the marble bust of James Gillespie by the obscure Robert Burn (fl. 1790–1816) and the bronze figure in Roman armour at the City Chambers, Edinburgh, which may represent Charles Edward Stuart or Louis XV. James Tassie (1735–99) was born in Glasgow and trained as a stonemason. He attended the Foulis Academy, founded in Glasgow in 1754 by the printmaking brothers Robert and Andrew Foulis, before moving to Dublin and then London. He developed a formula for making casts in vitreous paste and manufactured casts of antique carved gems. He also produced portrait medallions and among his sitters were many leading figures in Scottish intellectual life, such as Adam Smith, David Hume and Henry Raeburn.