The hypothesis of the collector, the man who keeps a rain-gauge, or the missionary among savages, is to be discounted from as a source of error.
A simple rain gauge can help you tell if your pumpkins have enough water or nor.
Apart altogether from the variations of actual rainfall produced by irregular surface levels, the very small area of a single rain-gauge is subject to much greater variations in short periods than can possibly occur over larger areas.
Diet.); a rain-gauge is an instrument used to measure the amount of rainfall (see Meteorology, where the, whole subject of precipitation is fully treated).
Such examples show the importance of placing any rain-gauge, so far as possible, upon a plane surface of the earth - horizontal, or so inclined that, if produced, especially in the direction of prevailing winds, it will cut the mean levels of the area whose mean rainfall is intended to be represented by that gauge.