Wing saw
A wing saw is a pole saw for pruning standing trees . The saw is placed on a pole several meters long so that forest workers can saw off dry branches and twigs from tree trunks without a ladder . The wing saw was invented by the forestry expert Georg Friedrich Wilhelm Alers and was then patented in 18 German and five European countries .
Description in literature
Alers published his invention in 1868 in the book Ueber das Aufästen der Waldtrees by using the height saw or wing saw. In the work he describes the forestry benefit of the saw for the quality of the wood, since the sawing of dead branches on the tree trunk cannot develop knotholes that reduce the quality. He also makes extensive profitability calculations as well as comparisons with other pruning methods. In his book, Alers suggests using the saw primarily for conifers with their long trunks. The wing saw can also be used for deciduous and fruit trees . Sawing up to a height of 40 feet , the equivalent of 12 meters, is possible through long poles .
The Hanoverian forester Heinrich Christian Burckhardt rated the wing saw positively. Other well-known foresters of the 19th century, such as Carl Grebe from Eisenach , made similar statements .
literature
- Georg Friedrich Wilhelm Alers: About the pruning of forest trees by using the height or wing saw. 1868. ( Online )