This early works was originally published in 1921. PREFACE: It is hardly necessary to demonstrate to engineers the fundamental importance of the subject of heat transmission. Whilst the laws concerning the conduction of heat have been fairly well known for a long time, the laws of radiation and convection of heat are only now becoming more clearly understood. Although physicists have studied and experimented upon radiation and conduction of heat and formulated their laws, a perusal of our text-books on heat and on the properties of matter makes it apparent that physicists and chemists generally have almost completely neglected the equally important laws of convection, and the enunciation and verification of these laws of convection have been due mostly to the work of engineers.... Many of the earliest books, particularly those dating back to the 1900's and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, m