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 DICTIONARY OF AVIATION 135

ity of climate; passing thru points or places so char- acterized : as, an *isametal line.

isametral / ai-s9 / metX9l n. an isametjal line.

isaiiomal / ai-s9 / neni9l n. a line, as en a wethemnap, which passes thru points or places on the earth's surface having equal anomalies of temperature, atmosferic pressure, etc.; an isanomalous line.

is anomalous ,ai-S9'nem9-l9s adj. having or marking equal anomalies or departures from normal meteorolegic con- ditions.

isobar 'ai-s9,ba:z n. a line, as en a wether^map, which passes thru points or places on the earth's surface where the sea? level barometric pressure is the same (at a given time, or n the average for a given period) ; an isobanc line.

isobaric ,ai-S9'baezik adj. of equal weight or pressure; mark- ing equality of atmosferic pressure; passing thru points or places on the earth's surface tuhere the atmosferic pressure is the same; isobarometaic : as, an *isobaric line.

isobarometric ,ai-s9-b3ez9'metr,ik adj. of equal barometric conditions; marking equality in atmosferic pressure; pass- ing thru points or places on the earth's surface having such conditions, as a line en a wether^map; isobaric.

isobront 'ai-S9,b?ont n. a line, as en a wether^map, which passes thru points or places on the earth's surface at tuhich the first thunder is heard at the same instant of time; a line of equal front. In France the isobrent is drawn thru the points inhere the mean of the time at which the first and last thunder is heard is the same instant.

isochimal 'ai-s9,kai-m9} adj. [also spelt isocheimal] of an isochime or isochimes; of equal mean summer temperature; isochime,nal ; isochimonal : as, *isochimal lines, an *isochi- mal chart, compare isotheral.

isochime 'ai-s9,kaim n. [also spelt isocheim] a line, as n a wether^map, which passes thru points or places on the earth's surface where the mean winter temperature is the same; an isochimal line.

isochimenal ,ai-S9'kai-mi-nl adj. same meaning as iso- chimal.

isochimonal ,ai-s9'kai-m9-nl adj. [also spelt isocheimonal] same meaning as isochimal.

isohelic ,ai-S9'hii-hk adj. having equal amounts of clear sunshine ; marking equality as regards sunshine : as, an *iso- helic line.

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