The “Bursa Provincial Yearbook” states that thermal springs at Çekirge have three different sources. The temperature and chemical analysis of each of the sources is different. The springs here are called “Steel” (i.e., iron). The springs are of three types: Hot (female), warm (male) or horhor (“powerful and noisy”) springs. The rate of flow of the hot thermal water of the principle spring is 28 It./sec. with a temperature of 48° Centigrade. According to the former Ottoman system of measurement, the rate of flow of water or spring passing through a short pipe, whose inner diameter is 26 mm. and whose axis is 96 mm. below the level of water or spring, equals 1 lüle-that is, 36 It./min., or 52 cu. m./day. One lüle equals 4 kamis, which is the equivalent of 8 masura or 32 çuvaldiz or 64 hilal. Ottoman sources indicate that the rate of flow of this hot spring is 373 masura. The temperature of the second-warm-spring is 38-40° at its source and its rate of flow is 2.5 It,/sec. or 34 masura. The temperature of the Horhor spring is variable. In rainy periods, it becomes so cool that it cannot be used for bathing, which suggests that it mingles with a subterranean fresh water spring.