"The first, to recognize and apply this principle was Count Rumford (1796-1802). ...But he is to be blamed for not investigating or at least acknowledging the progress made by his predecessors in this particular. ...[H]owever much good he may have done in improving the form of the chimney-throat, and in calling public attention to the advantages of bevelled over rectangular jambs, he... also did much to discourage any further effort in economizing the waste heat of the smoke, and should therefore be considered as having really done more than any other one man to retard the proper development of the subject."