Tractor picturesApprentice Photoshop Pictures Contest - 15 image entries
Contest Directions: Photoshop this tractor image (click to download) any way you wish. Examples may - re-designing this tractor or giving it a new paint-job, putting the tractor into some environment, movies, paintings. These are just some ideas.
You have 3 days to submit your entry. Submitting it early will give you plenty of time to read the critique comments and edit your image accordingly.
Many thanks to Luiz Gustavo Sales and Stock Exchange for providing the source image.
[ browse best gallery pictures ] Tags: tractor
Jackpot: 1st place: $5, 2nd place: $3 , 3rd place: $2 , 4th place: $1
Started: 6/26/2008 8:00:00 AM, Ended: 6/30/2008 8:00:00 AM
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| This contest is fueled by the following news: |
| | Tractor vehicle is distinguished by low speed and high tractive force. The tractor is widely used in agriculture to plough land and to tow non self-propelled vehicles and instruments. The tractor can be equipped with hinged and semi hinged equipment of agricultural, construction or an industrial purpose (for example, drilling equipment).
Two basic types of tractors — roller and chain-track tractors. Both types have advantages and drawbacks.
It is possible to use roller tractor on general-purpose roads, on which the tractors can develop high speeds. However, their track adhesion with ground is limited and consequently, tractive force is also limited. On friable soil, such tractors can slip. To eliminate this drawback, tractors with drive on all wheels are created, however, such vehicles distinguish in huge weight and while moving on field, they heavily consolidate the earth. To reduce the pressure on soil, width of tractor tires is increased recently.
Chain –track tractors possess high tractive force, when compared to roller tractors. Main drawback of majority of chain-track tractors — inability to move on the asphalted roads without destroying the covering, exception is for tractors with rubber –cable chain. Low speeds of chain-track tractors (30—40 km/hr) are compensated by reduced pressure on ground because of large area of contact with ground, at same weight, as for a roller tractor. Chain-track tractors are widely used in agriculture, on weak bearing soils and in the industry due to its unpretentiousness.
Tractor components:
Main components of tractor: engine, transmission, undercarriage, control mechanisms, working and auxiliary equipment. Without dependence on type, diesel engine (earlier petrol engines were also used) is power plant of modern tractors. Steering control of roller tractors is similar to automobile steering control; one of the chain is stopped with friction clutch so as to make a turn. Working equipment: Tractors are equipped with hydraulic linkage, which serves for connecting the tractor with hinged and semihinged vehicles and work controlling of these vehicles. Hydraulic linkage consists of two main parts: linkage device and hydraulic system. PTO shaft is available in many tractors, which is meant for drive of working organs, aggregated with tractors of mobile or stationary vehicles.
History:
For the first time, vehicles, similar to tractors appeared in XIXth century and were steam vehicles. In the year 1850, English inventor William Howard used loco mobile for ploughing the soil. In the second halve of XIXth century, more than two thousand such machines were used in the fields of Great Britain. The first chain-track tractor was built in Russia by peasant Fedor Abramovich Blinov, a native of village Nikolsky, district Volsky of Saratov province. In 1879, he obtained patent ("privilege") on “Carriage with endless rails for transportation of cargo on highway and country roads”. This facility was put into operation by steam engine with 20 hp.
In 1896, first tractor with internal combustion engine was created by American engineers Hart & Parr. From 1901, such tractors were put on sale. Initially, farmers willingly bought them; however, soon new tractors were giving complaints: they were very heavy and consequently, tamping the soil heavily. The tractors were too big for an average farm. Tractors suffered with “children's illnesses”: often broke and repair was long and as well as too costly. However, new tractor models, without drawbacks of its predecessors, appeared for sale in 1907. By that time, repair shops for tractors were formed in America.
In 1912, firm "Holt-Parr" started manufacturing the chain-track tractors. |
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