Before we look further into the fire itself, let's see what we can find out about Herbert Swanson.
According to his tombstone, Herbert E. Swanson was born in 1908. His parents, Edward and Nannie C. Swanson and buried just below him at Rosehill:
Here's a picture of St. Ansgarius Church, and Rev. Lindskog:
Edward Swensen (sic) , son of Edward Swenssen (sic) and Nannie Freholm (sic) was born 05 Mar 1908 in Chicago.
The fire spread upward from the fifth to the 15th floor with a rapidity which surviving observers described as that of a flame thrower. The interior of the so-called fire resistance structure became an inferno in a matter of minutes.