C.D.is an experienced scarlet-dyer; but now, doubling their stock, they fall into a larger work, and they dye bays and stuffs, and other goods, into differing colours, as occasion requires; and this brings them to an equality in the business, and by hiring good experienced servants, they go on very well together.
The like happens often when a tradesman turns his hand from one trade to another; and when he embarks, either in partnership or out of it, in any new business, it is supposed he seldom changes hands in such a manner without some such suitable person to join with, or that he has some experienced head workman to direct him, which, if that workman proves honest, is as well as a partner.

On the other hand, his own application and indefatigable industry supply the want of judgment.

Thus, I have known several tradesmen turn their hands from one business to another, or from one trade entirely to another, and very often with good success.
For example, I have seen a confectioner turn a sugar-baker; another a distiller; an apothecary turn chemist, and not a few turn physicians, and prove very good physicians too; but that is a step beyond what I am speaking of.
But my argument turns upon this--that a tradesman ought to be able to turn his hand to any thing; that is to say, to lay down one trade and take up another, if occasion leads him to it, and if he sees an evident view of profit and advantage in it; and this is only done by his having a general knowledge of trade, so as to have a capacity of judging: and by but just looking upon what is offered or proposed, he sees as much at first view as others do by long inquiry, and with the judgment of many advisers.
When I am thus speaking of the tradesman's being capable of making judgment of things, it occurs, with a force not to be resisted, that I should add, he is hereby fenced against bubbles and projects, and against those fatal people called projectors, who are, indeed, among tradesmen, as birds of prey are among the innocent fowls--devourers and destroyers.

A tradesman cannot be too well armed, nor too much cautioned, against those sort of people; they are constantly surrounded with them, and are as much in jeopardy from them, as a man in a crowd is of having his pocket picked--nay, almost as a man is when in a crowd of pickpockets.
Nothing secures the tradesman against those men so well as his being thoroughly knowing in business, having a judgment to weigh all the delusive schemes and the fine promises of the wheedling projector, and to see which are likely to answer, or which not; to examine all his specious pretences, his calculations and figures, and see whether they are as likely to answer the end as he takes upon him to say they will; to make allowances for all his fine flourishes and outsides, and then to judge for himself.

A projector is to a tradesman a kind of incendiary; he is in a constant plot to blow him up, or set fire to him; for projects are generally as fatal to a tradesman as fire in a magazine of gunpowder.
The honest tradesman is always in danger, and cannot be too wary; and therefore to fortify his judgment, that he may be able to guard against such people as these, is one of the most necessary things I can do for him.
In order, then, to direct the tradesman how to furnish himself thus with a needful stock of trading knowledge, first, I shall propose to him to converse with tradesmen chiefly: he that will be a tradesman should confine himself within his own sphere: never was the Gazette so full of the advertisements of commissions of bankrupt as since our shopkeepers are so much engaged in parties, formed into clubs to hear news, and read journals and politics; in short, when tradesmen turn statesmen, they should either shut up their shops, or hire somebody else to look after them.
The known story of the upholsterer is very instructive,[10] who, in his abundant concern for the public, ran himself out of his business into a jail; and even when he was in prison, could not sleep for the concern he had for the liberties of his dear country: the man was a good patriot, but a bad shopkeeper; and, indeed, should rather have shut up his shop, and got a commission in the army, and then he had served his country in the way of his calling.