写真

Photographer's Note

Veliko otkrice coveka - tocak ...

Tocak je kompaktni mehanicki uredjaj, oblika diska, blizak krugu. Svojim rotacionim kretanjem smanjuje trenje ali i vrsi transmisiju rotacionih kretanja. Kombinacijama sistema posebno povezanih tockova razlicitih i istih precnika mogu se proizvoditi vece izlazne rotacione brzine kao i vece izlazne sile. Tockovi su napravljeni od razlicitih vrsta materijala.
Tocak je evoluirani oblutak kamena, unapredjena oblica drveta. Prenos kamenih visetonskih blokova obavljao se naizmenicnim podbacivanjem drvenih oblica pod blokove, po kojima se kotrljao. Pronalazak tocka se smatra jednim od vaznijih dostignuca u razvoju ljudske civilizacije. Mnogi istrazivaci tvrde da se pojavio u 5. milenijumu p. n. e. i da je vezan za otkrice grncarskog tocka odnosno grncarskog kola. Prva prakticna promocija tocka su svakako grncarsko kolo i tockovi kojima se pomejraju i prenose tereti i ljudi. Vremenom primjena tockova postaje mnogonamijenska.
Izum tocka pada u doba kasnog Neolita, i na to se moze gledati u kontekstu drugih tehnoloskih napredaka koji je doveo do nastanka ranog Bronzanog doba. Ovo podrazumeva prolazak nekoliko milenijuma bez prisustva tocka cak i nakon izuma poljoprivrede i grncarstva, tokom Aceramskog Neolita (9500-6500 p. N. E .).



The great discovery of man - the wheel ...

The wheel is a compact mechanical device, disk-shaped, close to a circle. With its rotational movement, it reduces friction, but also transmits rotational movements. Combinations of systems of specially connected wheels of different and the same diameters can produce higher output rotational speeds as well as higher output forces. The wheels are made of different types of materials.
The wheel is an evolved pebble of stone, an improved form of wood. The transfer of stone multi-ton blocks was done by alternately throwing wooden forms under the blocks, on which it rolled. Finding a point is considered one of the most important achievements in the development of human civilization. Many researchers claim that it appeared in the 5th millennium BC. n. e. and that it is related to the discovery of the potter's wheel or potter's wheel. The first practical promotion of the wheel is certainly the potter's wheel and the wheels that move and transport loads and people. Over time, the use of wheels becomes multi-purpose.
The invention of the wheel falls in the late Neolithic era, and this can be viewed in the context of other technological advances that led to the early Bronze Age. This implies the passage of several millennia without the presence of points even after the invention of agriculture and pottery, during the Aceram Neolithic (9500-6500 BC).

ikeharel, jemaflor, NickVu, Fis2, pierrefonds, aliabazari, adramad, mcmtanyel has marked this note useful

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Additional Photos by Pavle Randjelovic (pajaran) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 13605 W: 2948 N: 28152] (115911)
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