F.
Harrison had a principal contestant for the tempting prize at that time, an English mathematician
called John Hadley, who developed sextant. The sextant is the tool that people adopt to measure angles, such
as the one between the Sun and the horizon, for a calculation of the location of ships or planes. In addition,
his invention is significant since it can help determine longitude.
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G.
Most chronometer forerunners of that particular generation were English, but that doesn’t mean
every achievement was made by them. One wonderful figure in the history is the Lancastrian Thomas
Earnshaw, who created the ultimate form of chronometer escapement the spring detent escapement and
made the final decision on format and productions system for the marine chronometer, which turns it into a
genuine modem commercial product, as well as a safe and pragmatic way of navigation at sea over the next
century and half.
Questions 1-5
The passage contains seven paragraphs,
A-G.
Which paragraph contains the following information?
Write the correct letter,
A-G.
NB
You may use any letter more than once.
Q1. A description of Harrison’s background
.................
Q2. Problems caused by poor ocean navigation
.................
Q3. The person who gave financial support to Harrison
.................
Q4. An analysis of the long-term importance of sea clock invention
.................
Q5. The practical usage of longitude
.................
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