Smithsonian miscellaneous collections . this we must first consider the two stages locate the initial level of o meters in the pressure line of 760millimeters. In the dry stage we now obtain the difference of the altitudes inthe simplest manner by the adiabatic hypsometric formula — dh =CdT. If we take ap- „„„__ proximately C = 100 thenthe temperature diminu-tion of io° C. along anyadiabat corresponds to adifference of level of 1000meters. Therefore theintersection of any adia-bat with two tempera-ture lines io° apart givespoints in the altitudeline corresponding to1000 meters, 2
Smithsonian miscellaneous collections . this we must first consider the two stages locate the initial level of o meters in the pressure line of 760millimeters. In the dry stage we now obtain the difference of the altitudes inthe simplest manner by the adiabatic hypsometric formula — dh =CdT. If we take ap- „„„__ proximately C = 100 thenthe temperature diminu-tion of io° C. along anyadiabat corresponds to adifference of level of 1000meters. Therefore theintersection of any adia-bat with two tempera-ture lines io° apart givespoints in the altitudeline corresponding to1000 meters, 2000 me-ters, etc. If now we combine the points having equal altitude weobtain the level lines and these also are represented as straightlines. This construction is carried out in fig. 6. The altitude linesapproach each other as the temperatures increase and at the sametime are inclined to each other. In the condensation stage the altitudes at which certain condi-tions are attained when the initial level is at 760 millimeters,. FIG. 6. ALTITUDE LINES FOR THE DRY STAGE 478 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 51 are determined, first, from the final condition p, t, either step bystep from the equation (14) or from the adiabatic formula (18),in which case x must first be computed for each final table 7 the altitudes are computed for the adiabats of saturatedair, whence we find by interpolation the conditions at any otherdefinite altitude such as 1000 or 2000 meters as given in table K. Table K. Table for h in the condensation Stage INITIAL CONDITIONS h 760 30° 760 2 0° 760 io° 760 o° 760 — io° 760 -20° m mm °C mm 0 C mm 1 0 C 1 mm °C mm °C mm °c 0 760 30-0 760 760 760 760 — 10. 0 760 — 20. 0 1000 679 677 673 670 — 667 663 2000 ]6oS 2 60O 594 - 589 -13-6 5S4 — 26. 3 — — 3000 539 532 S24 — 5i5 — — — — — 4000 479 470 0. 5 460 — 449
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