[ 373 ] 
XII. On the Convection of Heat from Small Cylinders in a Stream of Fluid . 
Determination of the Convection Constants of Small Platinum 
Wires with Applications to Hot- Wire Anemometry. 
By Louis Vessot King, BA. {Cantab.), Assistant Professor of Physics, 
McGill University, Montreal. 
Communicated by Prof. Howard T. Barnes, F.R.S. 
Received May 5,—Read May 28, 1914. 
[Plate 8.] 
Contents. 
PART I. 
Mathematical Theory of the Convection of Heat from a Cylinder of any Form of 
Cross-Section in a Stream of Fluid. Fnge 
Section 1. Introduction. . .".374 
,, 2. Boussinesq’s transformation.374 
,, 3. Solution of Boussinesq’s transformed problem.376 
,, 4. Calculation of heat loss under the hypothesis of constant flux over the boundary . . 378 
,, 5. Numerical evaluation of the functions employed in the preceding section . . . . 379 
,, 6. Approximate formulas for the heat loss..380 
„ 7. Note on the interpretation and application of the preceding theory.382 
PART II. 
Experimental Determination of the Convection Constants of Small Platinum Wires. 
. 383 
. 384 
. 390 
. 392 
Section 8. Introduction.. 
,, 9. Experimental arrangements. 
„ 10. On the constants of the platinum wires under test 
,, 11. On the calculation of temperatures. 
12. On possible sources of error in the calculation of temperatures. 
13. On the reduction and interpretation of the observations. 
14. On the variation of the convection constants with inclination to the direction of 
the stream. 
15. Note on the calculation of the free convection of heat from small platinum wires 
393 
398 
402 
402 
PART III. 
On the Design of Portable Hot-Wire Anemometers. 
Section 16. Introduction.104 
„ 17. General considerations on the design of hot-wire anemometers.405 
„ 18. Note on the applications of the hot-wire anemometer. 
407 
YOL. CCXIY.-A 520. 
Published separately, November 12, 1911. 
