Exercise 2: sample answer

In favour:
1. It works day and night, in any weather, unlike a sundial.
2. It strikes a bell automatically, so the community hears the hour without anyone watching a device.
3. It gives a steadier and more convenient hour than a water clock and does not freeze or need refilling.

Against:
1. It is expensive to buy and to maintain, and needs a skilled keeper.
2. It is not very accurate: it drifts by minutes a day and must be reset against a sundial, so you would still need the older device.

The reasoning matches why many towns and cathedrals did buy one: prestige and convenience outweighed the cost, even though the early clocks were not precise.