The T5 series consists of 20 disks, “The Centuries”, and presumably represents each century of the last two millennia. This, number 14 in the series, looks like the 14th century, 1300 to 1399:
One of the main features of this disk, and the 14th century as well, is the mechanical clock. Scholars are uncertain as to who invented the first clock, and where, but most are agreed that as of the middle of the century there weren’t any mechanical clocks, but by the end of the century there were. Of course, the preceding centuries had seen many ingenious mechanical devices such as water clocks (clepsydrae) and bell-ringing devices, but some ingenious person in the 1360s or 1370s devised a mechanical escapement that allowed a machine to measure the passage of time.
Down at the right you can see a cannon exploding. Again, cannons have probably been in use in China for many years, but the first recorded use of English cannons was during the Hundred Years’ War, at the Battle of Crécy, in 1346. The earliest picture of a cannon is generally agreed to be in “De Nobilitatibus Sapientii Et Prudentiis Regum,” by Walter de Milemete, in 1326.
Here’s the original artwork: