Hair rollers
device
Small cylinders that hair is wound around so it dries into curls; heated rollers are warmed up before use.
Principles and materials it uses
- Plastic — is made of. Modern hair rollers are made of plastic.
Where it is used
- Permanent wave — is used in. The strands are wound on perm rods, which are essentially hair rollers.
Things built in a similar way
- Curling iron — works like. Both shape a curl: a curling iron does it at once with heat, rollers while the hair dries or cools.
How important it is
Rank in the importance rating of inventions: 1395 of 2848, score 45.3 out of 100. Direct links to other things: 3; fields of technology it appears in: 2; things built directly on it: 1. Hall of fame of inventions.
Similar things of the same time and field
- Heating element (1890) — A high-resistance conductor that turns current into heat.
- Electric fan (1882) — A fan with an electric motor.
- Thermostat (1883) — Keeps a set temperature (bimetal, electronics).
- Refrigerator (1913) — A household refrigerator with a compressor.
- Gas lamp (1807) — Street lighting with coal gas.
- Freezer (1940) — A deep-freeze compartment.
What it has in common with other things
- Hair rollers and piston pump: what they have in common — a link in 6 steps
- Hair rollers and lathe: what they have in common — a link in 6 steps
- Hair rollers and internet: what they have in common — a link in 5 steps