(a(i))[1]
The rain-gauge shape makes the scale non-linear. With reference to Fig. 2.1, explain what is meant by a non-linear scale.
(a(ii))[1]
Suggest why this non-linear scale is useful in a rain-gauge.
(b(i))[1]
On one day, the rain-gauge records $7.5\,\text{mm}$ of rain. On Fig. 2.1, show the water level in the rain-gauge.
(b(ii))[1]
A student lifts the rain-gauge to take a reading. Suggest one possible source of error this creates in reading the rain-gauge.
(c(i))[1]
Suggest a reason why the rain-gauge is made from transparent material.
(c(ii))[1]
Suggest a reason why the rain-gauge has a spike.