Agricultural Science
WAEC 2007
Study the diagrams below and use them to answer questions (a) to (c).
a) ldentify the equipment illustrated by diagrams D, E, F, and G.
(b) State the farm operation for which the equipment illustrated by diagrams D,E,F and G.
(c) Enumerate two specific uses of each of the equipment illustrated by diagrams F and G.
(d) State six general ways of maintaining the equipment illustrated by diagrams F and G.
Explanation
(a) ldentification of equipment D to G:
- D = Gunter's chain;
- E = Cross staff;
- F = Prismatic compass;
- G = Theodolite.
(b) Farm operation for which the equipment are generally used:
- They are all survey equipment or used for farm surveying
(c) Use of equipment F and G:
F - Prismatic compass;
- Assisting in locating baseline or places.
- Taking direction with reference to the magnetic meridian.
G-Theododite:
- Measuring horizontal and vertical angles.
- Triangulation in chain survey of plane.
- Rectangular coordinates for location of points.
- Determines elevation.
- Location or sighting of station.
(d) Ways of maintaining equipment F and G:
- Clean or wash and dry properly as appropriate after use.
- Grease/oil the necessary metal parts.
- After use, ensure that the screws, bolts, and nuts are properly secured.
- Protect the equipment from getting wet particularly specimen G.
- Use the equipment according to manufacturer's instructions.
- After use and cleaning store in cool dry place.
- Keep the prismatic compass away from the magnetic field.
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