erasistratos discovered the different valves of the heart.
erasistratos discovered the different valves of the heart.
who discovered the different valves of the heart?
erasistratos
Na
Na
the last major improvement to the steam engine was the corliss engine. named after its inventor, george henry corliss, this stationary steam engine was introduced to the world in 1849. the engine boasted a number of desired features, including fuel efficiency (lowering cost of fuel by a third or more), low maintenance costs, 30% higher rate of power production, high thermal efficiency, and the ability to operate under light, heavy, or varying loads while maintaining high velocity and constant speed. while the engine was loosely based on existing steam engines keeping the simple piston-flywheel design, the majority of these features were brought about by the engine's unique valves and valve gears. unlike most engines employed during the era that were using mainly slide-valve gears, corliss created his own system that used a wrist plate to control a number of different valves. each cylinder was equipped with four valves, with exhaust and inlet valves at both ends of the cylinder. through a precisely tuned series of events opening and closing these valves, steam is admitted and released at a precise rate allowing for linear piston motion. this provided the engine's most notable feature, the automatic variable cut-off mechanism. this mechanism is what allowed the engine to maintain a set speed in response to varying loads without losing efficiency, stalling, or being damaged. using a series of cam gears, which could adjust valve timing (essentially acting as a throttle), the engine's speed and horsepower was adjusted. this proved extremely useful for most of the engine's applications. in the textile industry, it allowed for production at much higher speeds while lowering the likelihood that threads would break. in metallurgy, the extreme and abrupt variations of load experienced in rolling mills were also countered by the technology. these examples demonstrate that the corliss engine was able to lead to much higher rates of production, while preventing costly damages to machinery and materials. it was referred to as “the most perfect regulation of speed.”
steam power during the industrial revolution