-
self winding wach
Invented in1923 by John Harwood. He used a pivoting weight which swung as the wearer moved, winding the mainsprig. The ratchet mechanism wound the mainspring only when moving in one direction. -
traffic signal
Acme Traffic Signal Co., paired “Stop” and “Go” semaphore arms with small red and green lights. Bells played the role of today’s amber or yellow lights, ringing when the flags changed—a process that took five seconds. By 1923 the city had installed 31 Acme traffic control devices -
aerosolcan
type of dispensing system which creates an aerosol mist of liquid particles. This is used with a can or bottle that contains a liquid under pressure. When the container's valve is opened, the liquid is forced out of a small hole and emerges as an aerosol or mist. As gas expands to drive out the payload, only some propellant evaporates inside the can to maintain an even pressure. -
neoprene
synthetic rubbers that are produced by polymerization of chloroprene.[1] Neoprene exhibits good chemical stability, and maintains flexibility over a wide temperature range. It is used in a wide variety of applications, such as laptop sleeves, orthopedic braces (wrist, knee, etc.), electrical insulation, liquid and sheet applied elastomeric membranes or flashings, and automotive fan belts -
scotch tape
richardrew developed a transparent matiral nown as cellophane scach tapeis a brand name minging stingy
