Best Times to Go to Florence, Italy. Avoid summers if you can, it's hot and packed with sweating tourists in July and August. That said, there's hardly a time you won't encounter tourists in Florence. If you must go in summer, make hotel reservations early.
Helical. Helical (adjective) is having a spiral form of many rounds. Helical can be a hairstyle curl, loop fold of a ribbon that serves as pony and a repeated dialogue of an actor that gives twist to the audience.
A thread is a helical-shaped groove cut in a cylindrical hole (the female thread), or a helical-shaped ridge on a cylindrical bar, rod, shank, etc (the male thread). A tap is used to cut the helical groove that fits the thread of the screw. A threading die is used to cut threads on a pipe. A thread is a helical-shaped groove cut in a cylindrical hole, or a helical-shaped ridge on a cylindrical bar, rod, shank, etc.