Journal of Agricultural Research . and then uniting them byan acid-free solder. The wires used were No. 36 copper and No. 36 con-stantan, with insulated connecting length A, B, and B, totaling approxi-mately 3 feet. Accepted for publication June 25, 1923. Published with the approval of the Director. Contributionfrom the department of botany, Kansas Agricultural Experiment Station, paper No. 200. Acknowledgments are due Prof. E. V. Floyd and G. E. Raburn, of the department of physics, KansasState Agricultural College, for their aid and advice in regard to the temperature measurements. • Referen
Journal of Agricultural Research . and then uniting them byan acid-free solder. The wires used were No. 36 copper and No. 36 con-stantan, with insulated connecting length A, B, and B, totaling approxi-mately 3 feet. Accepted for publication June 25, 1923. Published with the approval of the Director. Contributionfrom the department of botany, Kansas Agricultural Experiment Station, paper No. 200. Acknowledgments are due Prof. E. V. Floyd and G. E. Raburn, of the department of physics, KansasState Agricultural College, for their aid and advice in regard to the temperature measurements. • Reference is made by number (italic) to Literature cited, p. 43-44. Journal of Agricultural Research, Vol. XXVI. No. i Washington, D. C. Oct. 6, 1923 aew Key No. Kans. -38 (IS) i6 Journal of Agricultural Research Vol. XXVI, No. I One of the thermojunctions was placed with a thermometer graduatedto ° C. in a stoppered Dewar flask, DF, containing a small amount ofwater, W, and surrounded by a jacket of glass wool and water, GW, in a. Fig. I.—Diagram of the apparatus used in determining the surface temperature of leaves: TO, TC, thermo-junctions; A, insulated constantan wire No. 36; B, B, insulated copper wire No. 36; C, clamp for hold-ing thermojunction on leaf; CK, cork insulation; G, galvanometer; K, key; SC, short circuit; DF,Dewar flask; W, water in flask; GW, glass wool and water surrounding the flask; T, thermometer. 2-gallon porcelain jar. The temperature of the air in the flask remainedpractically constant, since under the most severe conditions it did notfluctuate more than o. i° C. during a 15 to 20 minute period. Oct. 6,1923 Temperature of the Leaves of Crop Plants 17 The other thermojunction, TC, was attached to a clamp, C, in such away that it could be conveniently placed upon the surface of a leaf. Thisclamp consisted of a pair of brass tongs modified by completely inclosingtheir distal ends with heavy layers of cork, CK, shaped into a wedge formso that the dimens
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