Surely, someday it has started raining while you were on a drive. The following picture shows a windscreen wiper (invented by Mary Anderson) of the beginning of the 20th century. Obviously, its design has evolved a lot since then, but, without any doubt, thanks to this invention, we can now drive safely when it rains or snows:
a) Using arrows, match the number of each piece with its name:
| Part 1 |
handle |
| Part 2 |
set-screw |
| Part 3 |
arm |
| Part 4 |
rubber |
| Part 5 |
centre of support |
| Part 6 | spindle |
b) Currently, windscreen wipers work automatically by means of an electric motor, but initially this was not the case. How do you think the windscreen wiper in the previous image worked?
c) Draw the sketch and outline of the windscreen wiper of your car. (Remember that the outline has measurements and more details than the sketch).
| SKETCH: | OUTLINE: |
d) The following picture shows us a windscreen of a car that does not have windscreen wipers. You have to design the necessary windscreen wiper(s) so that when it rains we can drive without problems.
