b a piece of metal on w a te r...
c a piece of wood and string with knots in i t ...
d a watch that works on a ship ...
e two radar signals ...
1) your exact position
2) the speed a ship is moving
3) how far east or west you are
4) how far north or south you are
5) the direction you are moving in
After you read
13 Work in pairs. Act out this conversation between John Harrison
and a Greenwich scientist.
Student A: You are John Harrison. You have invented a watch
that works on a ship but have only had half the prize
money. You feel this is unfair.
Student S: You are a scientist at Greenwich. You don’t feel that
Harrison should get all the prize money because he
is only a clockmaker. You feel that the money should
go to a scientist.
Chapter 4
Before you read
14 In which century do you think each of these was invented?
a the cannon
the handgun
c the repeating handgun
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