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DRYING AND STORAGE OF GRAIN IN BULK
The combine harvester delivers grain in too damp a condition for prolonged storage. Various methods of drying have been introduced.
A method of drying has been developed which uses storage bins with porous floor through which the drying air is forced. The air is warmed by means of an electric heater. The process of drying the grain is extended over days instead of hours by this method; the size and cost of the drying plant is correspondingly reduced; use is made of the natural drying capacity of the air and efficiency thereby increased. A recent development has been to use cylindrical bins of perforated metal to introduce the air via a perforated duct running down the axis of the cylinder. The power requirement for the fan is thereby reduced to less than half that necessary for floor ventilated bins.
Electric motors and heaters are ideal for use with ventilated bins because they can run for days without attention and there is no risk of fire or grain contamination. Control of the heat can be by hand, by time switch or by humidity sensitive switch.

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1) delivers – Present Simple Active
2) have been introduced – Past Participle Passive
3) has been developed – Past Participle Passive
4) is forced – Past Participle Passive
5) is warmed – Past Participle Passive
6) uses – Present Simple Active
7) is extended – Past Participle Passive
8) to increased – Past Participle Active
9) has been to use – infinitive, present
10) to introduce – infinitive, present
11) is reduced – Past Participle Passive
12) is made – Present Simple Passive
13) can run – modal + the present active
14) can be – modal + the present active
15) are use – Present Simple Active

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The combine harvester delivers grain in too damp a condition for prolonged storage. Various methods of drying have been introduced.
A method of drying has been developed which uses storage bins with porous floor through which the drying air is forced. The air is warmed by means of an electric heater. The process of drying the grain is extended over days instead of hours by this method; the size and cost of the drying plant is correspondingly reduced.

natural drying capacity of the air is used and the efficiency is thereby increased. A recent development has been made to use cylindrical bins of perforated metal to introduce the air via a perforated duct running down the axis of the cylinder. The power requirement for the fan is thereby reduced to less than half that necessary for floor ventilated bins.

Electric motors and heaters are ideal for use with ventilated bins because they can run for days without attention and there is no risk of fire or grain contamination. Control of the heat can be performed by hand, by time switch or by humidity sensitive switch.

Heat can be controlled either manually, via time switch or via a switch that is sensitive to humidity.

1) present, active
2) the past participle, passive
3) the past participle, passive
4) the past participle, passive
5) the past participle, passive
6) present, active
7) the past participle, passive
8) past, active
9) infinitive, present
10)infinitive, present
11) the past participle, passive
12) modal + the present active
13) modal + the present active