Men working on the heating system of a skyscraper under construction in New York. A man working on a steel girder. Men connecting wire and planks of wood to steel girders. Men rolling out a thick roll of material on the newly constructed floor of a skyscraper. Men covering a floor with cement. A man empties a wheel barrow. Men working in unison to smooth the cement floor. A mass of electrical wires. A man working on electrical outlets.