that he has read in Herons treatise uponhydraulic clocks that the Egyptians had apparatus of thiskind that began to work automatically at sunrise. For thispurpose there was employed as upper reservoir a very thinglass or metal globe, which was provided internally with asiphon, D E, rising to a… … Fig. 4.-H£B0NS CONSTANT DISCHABGE SIFHON. that struck the globe expanded the air, and, causing thewater to rise in the siphon, primed the latter. The dis-charge then continued until the globe was empty. Withtwo clocks of this kind running alternately it was unneces-sary to rise at daybreak unless…
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