Three years later Smith launched out as young drawing-master, pencil-portrait draughtsman, and topographical engraver. He found a patron in Mr. Richard Wyatt, of Milton Place, Egham. Through this gentleman he obtained commissions as a topographical artist from influential collectors like the Duke of Roxburgh, Lord Leicester, and Horace Walpole. Moreover, Sir Joshua Reynolds and Benjamin West sometimes engaged him to bid for them at print auctions. At this time he was a frequent visitor to the drawing-room of Mrs. Mathew, in Rathbone Place, where Flaxman was often found, and where William Blake read aloud his early poems.

The small artist, and particularly the topographical artist, had his chance in the second half of the eighteenth century. The productions of Wilson, Reynolds, Romney, and Gainsborough had stirred up the arts of engraving, which allied themselves closely to literature and life. It was the age of portly topographies and county histories, with their ceremonious array of plates; of itinerant portrait and view painting; and of night-sales of books and prints at which sociable collectors sat under eccentric auctioneers, and at which noblemen were as commonly seen as they were at boxing and trotting matches fifty years later. Shops abounded for the sale of new prints, and auctions were frequent for the distribution of old. Human types were produced of which we know little to-day. Smith has drawn some of them with easy and natural touches in his chapter on the print-buyers who attended Langford’s and Hutchins’ sale rooms, in Covent Garden, in 1783. There he was in his element. Not much passed in the art world in the fifty years following that date that Smith did not know.

When twenty-two, he married. The girl of his choice was Anne Maria Pickett, who belonged to a respectable family at Streatham, and who, after forty-five years of married life, was left his widow. They had one son and two daughters. The son died at the Cape in the same year as his father, 1833. One daughter was married to Mr. Smith, a sculptor, and the other to Mr. Paul Fischer, a miniature painter. Soon after his marriage he was invited by Sir James Winter Lake to take up his residence at Edmonton, where he taught drawing to their daughter, and doubtless had other pupils. When he applied (unsuccessfully) for the post of drawing-master to Christ’s Hospital, Sir James and Lady Lake’s testimonial made a point of the fact that he had never touched up their daughter’s work, “a practice too often followed by drawing-masters in general.” At this period Smith practised as an itinerant portrait painter, a branch of art which then had its vogue, and was to number William Hazlitt among its professors. At Edmonton it was that he “profiled, three-quartered, full-faced, and buttoned up the retired embroidered weavers, their crummy wives and tight-laced daughters.” At Edmonton, too, he watched the reception of his first book, the Antiquities of London and its Environs. Smith’s career for the next thirty years may be conveniently sketched in a list of his residences and the work he accomplished in each.

In 1797 he was at No. 40 Frith Street, Soho, a house which still exists, with its ground floor converted into a French wine shop. There he published his Remarks on Rural Scenery, consisting of etching of cottage and village scenes in the neighbourhood of London, with a preliminary essay on drawing.

In 1800 he was living with his father at 18 May’s Buildings, or the “Rembrandt Head,” as it was styled, in St. Martin’s Lane. In this year the discovery of curious paintings during the alterations to St. Stephen’s Chapel for the enlargement of the House of Commons, attracted Smith’s attention, and, after making careful copies of these relics, he projected his Antiquities of Westminster.

In February 1806, Smith published an etching of the scene on the Thames when Nelson’s remains were brought from Greenwich to Whitehall. He tells us that on showing it to Lady Hamilton she swooned in his arms. The plate is inscribed: “Published February 15, 1806, by John Thomas Smith, at No. 36 Newman Street.” This house remains unaltered.

In 1807 he issued his Antiquities of Westminster, his address appearing in the imprint as 31 Castle Street East, Oxford Street.

In 1810, May’s Buildings reappears in the imprint of his Antient Topography of London, but it may be that this address was not residential. The site of this house is merged in Messrs. Harrison’s printing works.

In 1815-17, Smith lived at No. 4 Chandos Street, Covent Garden, whence he issued his Vagabondiana, or Anecdotes of Mendicant Wanderers through the Streets of London.