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<br />. -! ~ <br />Lv ,L \.". :. Z, <br /> <br />and <br /> <br />loge <br /> <br />Oa -0 <br />e a - eo <br /> <br />tb ll. <br />irs <br /> <br />qr, changiDg to the exponential torm <br /> <br />Ga-19 <br />GEl. - eo <br /> <br />- tbx <br />= e ""iiS <br /> <br />and <br /> <br />(]=G <br />a <br /> <br />- tbx <br />+ (00- Qa) e-'""iS <br /> <br />In th8 case ot a W8.ter surface loeing heat by oonvection, <br /> <br />radiation and evaporation in cold weather, the velue ot t is <br /> <br />t = 1. 75 + O.25V <br /> <br />2.00";' 0.22V <br /> <br />where <br /> <br />v = air velocity in tset per second. <br /> <br /> <br />(tor still air assume V = 1.0 tt./sec.) <br /> <br />4 <br />