
author
Best known for a practical early-20th-century guide to industrial refrigeration, this little-known technical writer helped explain how artificial ice could be produced efficiently and economically. His work captures a moment when modern cooling systems were beginning to reshape everyday commerce.

by Otto Luhr, Herman Friedl
Herman Friedl is a somewhat obscure author whose surviving reputation rests mainly on Manufacturing Cost Data on Artificial Ice, a technical work credited to him and Otto Luhr. The book was issued through Project Gutenberg from an older public-domain source, which identifies Luhr as a consulting engineer and Friedl as an architect connected with an ice-making system in Chicago.
Rather than writing literary nonfiction or fiction, Friedl worked in a practical, industrial mode. Manufacturing Cost Data on Artificial Ice focuses on the business and mechanics of making commercial ice, including plant design, production figures, and operating costs. That makes his writing especially interesting today as a snapshot of an era when artificial refrigeration was emerging as a cleaner, more controllable alternative to harvested natural ice.
Very little biographical information about Friedl could be confirmed from reliable sources beyond this publication record, so much of his personal life remains unclear. What does survive suggests a writer closely tied to the technical and commercial world of early refrigeration rather than to the conventional literary scene.