Abstract : (1) Average heat transfer coefficients on a uniformly heated cylinder. Experimental data were presented for a Reynolds number range from 40 to 100,000 and for Prandtl numbers from 1 to 300. The effects of temperature differences large enough to produce significant changes in viscosity across the boundary layer were correlated in terms of a viscosity ratio. (2) Local heat transfer coefficients on a uniformly heated cylinder. Analysis of the heat transfer in the laminar boundary layer using integral methods was compared with original experimental measurements of the local heat transfer coefficients around a cylinder. (3) Critical heat flux for nearly saturated water flowing normal to a cylinder. Visual and photographic observations were used to construct a physical model of transition from nucleate to film boiling. (4) Critical heat flux for subcooled water flowing normal to a cylinder. The maximum flux which can be accommodated in subcooled nucleate boiling varies directly with the velocity and subcooling and inversely with a fractional power of the heater diameter.