1. Presentation of a chainsaw

2. History The origin is debated, but the first chainsaw was probably made around 1830 by the German orthopaedist Bernard HeineThe origin is debated, but the first chainsaw was probably made around 1830 by the German orthopaedist Bernard Heine Two important contributors to the modern chainsaw are Joseph Buford Cox and Andreas Stihl; the latter patented and developed a chainsaw in 1926 and a gasoline-powered chainsaw in 1929, and founded a company to mass-produce them

3. Construction Engine is almost always a two-stroke gasoline internal combustion engine or electric motor Drive mechanism : typically a clutch and sprocket. Guide bar: an elongated alloy steel bar with a round end typically 16 to 36 inches in length. An edge slot guides the cutting chain.Guide bar: an elongated alloy steel bar with a round end typically 16 to 36 inches in length. An edge slot guides the cutting chain.

4. Usability In most cases, chainsaws are used for woodcuttingIn most cases, chainsaws are used for woodcutting Special chainsaws are used to cut concrete, brick and natural stone. These use similar chains to ordinary chainsaws, but with cutting edges made using diamond.Special chainsaws are used to cut concrete, brick and natural stone. These use similar chains to ordinary chainsaws, but with cutting edges made using diamond.

5. In films and computer games, the chainsaw often features as a weapon or an instrument of murder or torture.In films and computer games, the chainsaw often features as a weapon or an instrument of murder or torture.

6. internal combustion engine and electric motor chainsaw

7. …AND SOME PICTURES …AND SOME PICTURES

8. Big Gus - world's largest running chainsaw

11. And lastly one videoAnd lastly one video http://www.youtube.com/watch?v=E9x8rBKC4BE&NR=1http://www.youtube.com/watch?v=E9x8rBKC4BE&NR=1http://www.youtube.com/watch?v=E9x8rBKC4BE&NR=1

12. Sources WikipediaWikipedia Google imagesearchGoogle imagesearch YoutubeYoutube