|Photography is the technique of painting by light, it is to acquire and save the static image on light-sensitive material (photo-film or array) with the help of photo-equipment and a camera.
A photograph or photo or snap is the final image, obtained as a result of the photographic process and can be seen directly.
Depending upon the principle of the working of photo-sensitive material the photograph is generally divided into three main categories:
Film photography: It is based on the photo-materials in which the photo-chemical processes takes place.
Electrographic and other processes, in which no chemical reactions take place, but there is a transfer of medium forming the image. There is no special general name for this type of category, before digital photography often the term “non-silver photograph” was used. Digital photograph - in the process of obtaining and saving the image there is movement of electronic charges, generally as a result of the photographic effect and in future processing, but there are no chemical reactions or transfer of mass. Actually, it should be called as Electronic photograph, as in the series of equipment traditionally belonging to “digital” ones; the analog processes take place (such as the first camera with electronic arrays, the Sony Mavica, and many cheap TV camera systems for video observation).
The shooting of movies, based upon photographic principles, is called cinematography.
The photograph is based on the developments of science mainly in the fields of optics, mechanics and chemistry. At the present stage the development of digital photography is taking place owing to developments mainly in the fields of electronic and information technology.
An exhibition is the public demonstration of the achievements in the fields of economics, science, technology, culture, art and other areas of social life. The notion can mean as the arrangement itself as well as the place of this arrangement.
There are different types of exhibitions viz. local, national, international and global, and also general, covering all the areas of common interest (e.g., Exhibition of National Achievements of the USSR) and the specialized ones, concentrating only on one area of public interest. The latter ones include the exhibitions of art, industry and agriculture. Also, exhibitions are divided as periodic (temporary) and permanent ones.
Exhibitions have their roots in French museums, which were started by Mazarin and Colbert. But the first exhibition, reminiscent of the modern day exhibition, was the one by Ecole des beaux arts in the year 1763. Its example was immediately followed by Dresden (1765), Berlin (1786), Munich (1788) and others.
The first industrial exhibition was organized in France in the year 1798, in Paris. Until 1806, four more exhibitions followed in Paris, but of a lesser scale.
The Eiffel Tower was constructed for the Global Exhibition of 1889 and was served as the entrance arch.