ArchiVision Directory

An hourglass is a glass with 2 bulbs on the end and a narrowing in the middle where the sand needs to go through. The package of sand that needs to go through the narrowing is mostly equal to 1 hour if all the sand has be flown into one bulb.

Goat leather for gloves.

A facsimile is an exact imitation of writings, printed matter, prints and drawings.

A tramp is an old glas object to measure the time. Sometimes it's called an hourglass.

An axe is a hatchet with a long handle, sometimes called an ax without an e. In the Middle Ages it was extensively used by lumberjacks to cut down trees. When there was war the axemen used their axes as a weapons.

Fusion is the energy of the sun and the stars, and the largest source of energy in the universe. The ITER fusion reactor that has to rise in Cadarache, France, costs billions of euro's to be paid by a number of countries including Japan and the USA. China is already building its own nuclear fusion reactor. It's a battle between lobbyists for power, money and new techniques because all of the great powers want to protect their energy sources. Will the nuclear fusion the energy source of the future? We will know perhaps until 2050. See on Wikipedia a larger definition of Nuclear Fusion and how it works. Nuclear Power Plant

What is an aneroid barometer? - Definition An aneroid barometer is a metal barometer, with an almost airless box with air pressure. It measures the pressure differences of air. The degree of structure of the box by the surrounding air is possible by using a needle on a distribution. The Barometer works on the principle of series-switched aneroid (vacuum) boxes or capsules (known as jewel case inserts of Vidi). These cases are usually made of phosphor-bronze or beryllium-copper. If air pressure rise than the boxes are more pressed in, the boxes are less pressed by low air pressure. Through a lever system, these changes were transferred to a needle that moves over a scale. Most home barometers are aneroid barometers. In Surveying (barometric elevation) make this system of sophisticated barometers (aneroid Paulin) service to the elevation of different points to be determined. A barometer usually contains mercury, the aneroid barometer contains no mercury. The aneroid barometer is only use...

What is an anemometer (short definition) An Anemometer is an instrument with which the wind can be determined. Windmill with hemispheres This instrument was introduced in 1846 by the Irish astronomer Thomas Romney Robinson (1792-1882). This instrument is a rotating windmill with three or four hemispheres (cups) with a rotating shaft rods to be confirmed. The axis is approximately perpendicular to the direction of the wind measurement. The hemispheres are hollow inside. If there are only three hemispheres then they are present prepared at 120° apart. The windmill will rotate because the wind on the concave side exerts more than on the convex side. The motion of the rotating balls through the ashes transform into a dynamo with an electrical voltage signal. The rotation speed of the wind speed are derived. This wind speed is expressed in meters per second or kilometers per hour. Paddle wheel Another form of an anemometer is used to measure the speed of the air (mine shafts, air ...