lower three copper denominations. Though the cartwheel design was used again for the 1799 penny (struck with the date 1797), all other strikings used lighter planchets to reflect the rise in the price of copper, and featured more conventional designs. Boulton greatly reduced the counterfeiting problem by adding lines to the coin edges, and striking slightly concave planchets. Counterfeiters turned their sights to easier targets, the pre-Soho pieces, which were not withdrawn, due to the expense, until a gradual withdrawal took place between 1814 and 1817. Watt, in his eulogy after Boulton's death in 1809, stated: In short, had Mr. Boulton done nothing more in the world than he has accomplished in improving the coinage, his name would deserve to be immortalised; and if it be considered that this was done in the midst of various other important avocations, and at enormous expense,— for which, at the time, he could have had no certainty of an adequate return,—we shall be at a loss whether most to admire his ingenuity, his perseverance, or his munificence. He has conducted the whole more like a sovereign than a private manufacturer; and the love of fame has always been to him a greater stimulus than the love of gain. Yet it is to be hoped that, even in the latter point of view, the enterprise answered its purpose. Activities and views Scientific studies and the Lunar Society Boulton never had any formal schooling in science. His associate and fellow Lunar Society member James Keir eulogised him after his death: Mr. [Boulton] is proof of how much scientific knowledge may be acquired without much regular study, by means of a quick & just apprehension, much practical application, and nice mechanical feelings. He had very correct notions of the several branches of natural philosophy, was master of every metallic art & possessed all the chemistry that had any relations to the object of his various manufactures. Electricity and astronomy were at one time among his favourite amusements. From an early age, Boulton had interested himself in the scientific advances of his times. He discarded theories that electricity was a manifestation of the human soul, writing "we know tis matter & tis wrong to call it Spirit". He called such theories "Cymeras [chimeras] of each others Brain". His interest brought him into contact with other enthusiasts such as John Whitehurst, who also became a member of the