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Andreas Stihl designed and hand built his first chainsaw in 1926. [5] The saw was electrically powered, and weighed about 48 kg (106 lb). [6] Stihl grew slowly initially, as the chainsaws came to the market about the same time as the Great Depression; with manpower cheap, and old two-man saws proven, there was no need for power saws.
Internal combustions engines require lubrication in operation that moving parts slide smoothly over each other. Insufficient lubrication subjects the parts of the engine to metal-to-metal contact, friction, heat build-up, rapid wear often culminating in parts becoming friction welded together e.g. pistons in their cylinders.
Additionally in forestry, pole pruners and pole saws are commonly used and these are often attached to poles that reach up to 5-6 m, this is a more efficient way of pruning than with ladders. These bush saws on polls have also been motorized as chainsaws which is even more efficient. Older technology used Billhooks, Kaiser blades and pruning ...
The ratchet pruner, which can handle stems thicker than two centimetres, fits in this category. Because they make a clean cut without crushing, bypass pruners are preferable for pruning live wood. [4] Parrot-beak pruners consist of two concave passing blades, which trap the stem between them to make the cut. These are suitable only for narrower ...
In navigation the instrument is also called a cross-staff and was used to determine angles, for instance the angle between the horizon and Polaris or the sun to determine a vessel's latitude, or the angle between the top and bottom of an object to determine the distance to said object if its height is known, or the height of the object if its distance is known, or the horizontal angle between ...
The 75th parallel north is a circle of latitude that is 75 degrees north of the Earth's equatorial plane, in the Arctic.It crosses the Atlantic Ocean, Europe, Asia, the Arctic Ocean and North America.
Many poles feature methods of easily switching between baskets, such as threading on the basket and pole. [16] Ski pole grip with adjustable strap. Grip: Attached to the upper part of the pole is a grip with a strap. These are slipped over the wrist to improve the skiers hold on the grip and to prevent the loss of the pole in the event of a fall.
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