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.
In helical gears, teeth are cut in the form of the helix around the gear. Their teeth are not parallel to the shaft axis. The helical gears run smoothly and more quietly at high speeds and curvilinear contact of gear teeth giving gradual engagement.