Commercial men regularly kept accounts with bankers. Merchants used division to apportion profits or losses to the parties whose capital was involved. Simple and compound interest were used. The concept of contract became a familiar one.
Regular private bankers of London emerged from the Goldsmiths from 1640 to 1675. They issued bank notes and paid checks.
Cromwell increased trade by seizing territories, establishing colonies, and warring with competitors for master of the seas and trade. In 1649 it was provided that no one who paid his assessment for soldiers' pay would have to quarter any of them.
Authority was given in 1649 to impress seamen: mariners, sailors, watermen, surgeons, gunners, ship carpenters, caukers, coopers, whoymen, and carmen for carriage of victuals.
English ships were embellished with decoration. Their sail area was increased by triangular fore and aft sails. The Navy increased from 39 to 80 vessels.
After serving in foreign wars, ex-soldiers were allowed in 1654 to practice any trade without serving a seven year apprenticeship.
Colonies New Hampshire and Maine were established in 1635, Connecticut in 1636, and Rhode Island in 1638, as offshoots from other colonies.
About 1650, steel was hardened by repeated quenchings and temperings when the steel had reached certain colors. Brass was made from copper and zinc alloyed together.
There were power-driven rolls for the coinage from 1657. Strips of silver were passed between engraved rolls. Then coins were punched out and their edges serrated.
In the 1650s, Huygens invented the pendulum clock, which increased the accuracy of time-keeping tenfold.