"Containing reference data useful in the design and construction of heating and ventilating installations, compiled from the Society's transactions, the investigations of its Research Laboratory, and the practice of its members; together with a catalogue and reference data section comprising essential and reliable facts, data and applications of manufacturers' equipment uniformly presented; an engineering and equipment section composed of illustrations and technical data on actual buildings, exemplifying the present state of the art of heating and ventilating and an index to modern equipment; [and] a directory of consulting engineers."