British Rainfall 1912, p.57

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	British Rainfall 1912, p.57 depth in the earth it is hoped that the changes of temperature in the receiver will be greatly retarded. Experience will show whether the means employed are sufficient to attain the end in view. The third difficulty, which is the most apparent to the observers of mountain gauges, is the correct measurement of the water collected. The principle of the "Bradford" gauge, with a modification, has been adopted. A rod, graduated to represent inches of rain for a five-inch funnel, is first inserted into the receiver,and the depth to which it is wet is noted. On account of the difference of area between the funnel and the receiver, one inch of rain corresponds to between one-half and one-third of an inch of rain in the gauge. To obviate the laborious process of emptying the gauge and measuring
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