In the 17th century yachts from Holland went to Denmark where they were used as merchants. In the middle of the 18th century they were considered to be the most beautiful and fastest merchant ships in the Baltic Sea. They were differed as one-and-a-half- and one masted yachts. One-and-a-half-masted yachts were divided into hooker-yachts, yacht-galleots and yacht-galleasses in accordance of their rigging types. According to Chapman the hooker-yacht had a long bowsprit, the mainmast with two topmasts joined with each other by cross-trees and caps, and three square sails. There was a main trysail with a gaff and a boom behind the mainmast. The mizzenmast also had a topmast and a sail with a gaff and a boom. The pictures from the book 'The German Sailing Ships' (1934) by H. Shtsimanski show that the rigging of one-and-a-half-masted yachts was sufficiently various. So, the galleot 'Emanuel' (1770) carried one lower square sail, the galleass 'Die Lerche' (1800) carried three square sails, and the hooker-galleot 'Themis' carried a mast with a topmast and two square sails.