Why is a grinder called a grinder - the origin of the name of the angle grinder tool for metal, what is the correct name and where it came from

Why is a grinder called a grinder - the origin of the name of the angle grinder tool for metal, what is the correct name and where it came from

Construction tools and machines are often given unusual names in people's everyday life. Some talk about belonging to some kind of manufacturer, others about the possibilities of devices and equipment. Such designations are so "firmly" included in the vocabulary that many builders find it difficu...

Street lamps: types and characteristics

Street lamps: types and characteristics

Street lighting is necessary for the comfort and safety of people, as well as for illumination of facades, alleys, buildings, streets and other places. When installing street lamps, special attention is paid to their technical characteristics, because they work under changing and sometimes unfavo...

What is a pump - types, classification, what it consists of, principle of operation, device, piston, dynamic, hydraulic pumps

What is a pump - types, classification, what it consists of, principle of operation, device, piston, dynamic, hydraulic pumps

Usually people do not notice what comfort rests on. The apartments have water supply, sewerage, hot and cold water, heating and air conditioning. The summer cottages have swimming pools and lawns. All this is impossible without the use of special equipment - pumps.There are fountains in the stree...

Which lens to choose for portrait photography

Which lens to choose for portrait photography

Author: Victoria Karaseva, lens selection specialist for portrait shootingThe expression or term "portrait lens" is often used when talking about a photographer. However, no particular lens can be called a portrait lens. But you can choose from a huge variety the one that is most suitable for por...