What is an echo sounder and how does it work?
A modern sea or river vessel cannot do without navigational instruments, one of which is a sonar. With...
What is an anemometer, and what does it measure?
Almost everyone has heard of the anemometer. The device is actively used in meteorological stations and is indispensable...
What is a heliograph? Why do I need it?
The word “heliograph” means “writing the sun” in Greek. Currently, there are two types of instruments bearing this...
What is a compass and what is it for?
The compass is one of the greatest inventions of humanity, a device for orientation. Its appearance is comparable...
What is a psychrometer and what is it for?
A thermometer attached to a window frame is usually sufficient for the average person to determine the weather...
Who invented the wheel and where did it happen?
It is hard to say what path human civilization would have taken if people had not invented the...
What is tin and what does it do?
Tin, a soft white metal, was one of the first metals that humans learned to work with. Scientists...
What is bronze and what is it made of?
Bronze is an alloy of copper with other metals, less commonly nonmetals. The most common name for bronze...
What is nitrogen and what is it used for?
Nitrogen is a chemical element with atomic number 7. It is an odorless, tasteless, and colorless gas. Therefore,...
What is sand, and what is its chemical composition?
Natural sand is a loose sedimentary rock that has formed over millions of years through weathering. Wind, rain,...