Williamson's new-found wealth enabled him to open a tavern in
Parliament Close bearing a sign worded,
Peter Williamson, Vintner From The Other World, in allusion to his time in North America. A wooden figure of him in
Delaware Indian costume stood at the head of the close to advertise its location. In 1769 Williamson opened a printing shop in the
Luckenbooths between
St Giles High Kirk and the north side of the
Royal Mile. He taught himself the craft of printing using a portable press purchased in London. He then invented his own portable
printing press and travelled to exhibitions and fairs to promote his new product. He also invented waterproof ink for stamping linen which withstood both boiling and bleaching. In 1773 Williamson compiled the first Edinburgh street directory in conjunction with his idea of setting up a regular postal service in the city. This comprised a list of streets and closes with the addresses of lawyers, merchants, officials and other notable gentlemen. Addresses of shops and taverns were also included, thereby not only hugely aiding navigation in the city but creating what is now a very valuable historical source. The Directory cost one shilling and was published regularly with relevant updates until 1796. In 1776 he launched a weekly magazine,
The Scots Spy or
Critical Observer but this ran only from 8 March until 30 August 1776. It was issued each Friday and contained articles and local gossip. He tried to revive this in 1777 under the title
The New Scots Spy but this second venture ran only from 29 August until 14 November 1777. In 1777 he married Jean the daughter of John Wilson, a bookseller in Edinburgh. They divorced in 1788. The
National Portrait Gallery in London has a print which appeared in
The Grand Magazine in June 1759 showing Williamson in full "Delaware Indian" dress with tomahawk and scalping knife. The caricaturist
John Kay drew him in Indian costume some time around 1768 and this drawing appeared in the preface of later editions of Williamson's autobiography. It also appears as portrait No.128 in Kay's "Original Portraits", a collection of drawings of Edinburgh characters of the time. ==Postal service==