Manufacturing Cost Data on Artificial Ice

In Short

This book is a specialized industrial prospectus written by consulting engineer Otto Luhr and architect Herman Friedl. It serves as both a sales document for their proprietary ice-making system and a financial manual for prospective plant owners. By providing granular data on energy consumption, labor wages, and equipment maintenance, the authors argue that their patented, high-efficiency system makes artificial ice a profitable, sanitary replacement for natural lake ice. It remains a valuable record of early industrial engineering and the economic realities of a bygone era.

The Story

The narrative moves from a bold market assertion to the nitty-gritty of engineering mathematics. It begins with the premise that natural ice—harvested from lakes and rivers—is becoming obsolete due to sanitary concerns. Luhr and Friedl argue that the future of the industry lies in artificial refrigeration, provided the manufacturing costs can be streamlined. They present their proprietary system as the solution, promising to halve labor costs compared to traditional methods through mechanical innovations, such as pulling entire rows of ice cans at once and maintaining a continuous, automated air supply.

The argument progresses through four distinct financial models, each representing a different plant capacity or operational strategy. The authors start by analyzing a 240-ton-per-day facility that utilizes a massive 18,000-ton storage house. They break down every cent of expenditure, from electricity rates to the specific salaries of chief engineers, storage men, and shipping clerks. This is not merely an abstract proposal; it is a rigid schedule of efficiency, calculating even the number of minutes required for an ice-puller to complete a task.

The central conflict within these models is the tension between labor efficiency and overhead. In their second model, they contrast a standard, labor-heavy ice plant with one upgraded by their patented system. By optimizing the process, they demonstrate a specific savings of nearly 23 cents per ton, providing a concrete financial incentive for a business owner to switch to their methods. The authors then pivot to different scenarios, such as plants powered by steam rather than electricity, and smaller facilities in medium-sized towns.

The arc of the book concludes not with a dramatic narrative resolution, but with the completion of these exhaustive financial tables. The final pages present the blueprints for success, leaving the reader with the impression that profitability is a matter of strict engineering discipline. The document acts as a blueprint for an industrial machine, where the goal is to drive the price of a ton of ice as low as possible. The story is one of transition: the slow, steady replacement of the natural world’s seasonal bounty with a controlled, year-round, mechanical process, ultimately paving the way for the home refrigerators that would eventually render these massive, centralized ice plants entirely unnecessary.

How It Unfolds

The market shift The authors introduce the transition from natural to artificial ice, citing sanitation as the primary driver for industry change. They establish the necessity of their system by positioning it as a way to lower labor costs to a point where artificial ice can compete with the price of harvested ice.

The mechanical edge The text outlines the five core advantages of the Luhr-Friedl system, emphasizing the automation of the ice-pulling process. These technical beats explain how the system reduces the manual strain on workers and increases the longevity of the equipment.

The financial breakdown The authors present detailed ledgers for plants ranging from 100 to 240 tons of daily output. These sections serve as the core of the argument, forcing the reader to confront the specific costs of electricity, labor, ammonia, and water.

The comparative analysis Luhr and Friedl directly contrast their patented system against existing, less efficient methods of the era. By showing the exact savings in cents per ton, they demonstrate the practical value of their engineering approach for potential investors.

The final estimation The book concludes with models for steam-powered plants, providing a comprehensive view of how different energy sources impact the bottom line. Each scenario is treated with equal rigor, ensuring that any reader, regardless of their local power constraints, can see the potential for profit.

The People

Otto Luhr and Herman Friedl are the central figures, acting as the architects of this industrial vision. Luhr, the consulting engineer, provides the technical expertise and the mechanical logic behind the system. He is driven by a desire for efficiency, seeing every minute of labor and every kilowatt of electricity as a variable to be optimized. Friedl complements this by grounding the system in architectural and structural reality, ensuring the ice plants are designed for continuous, high-volume production.

The individuals they address are the practical, often skeptical ice manufacturers of the day. These business owners want to maximize output while minimizing the headcount of laborers. Standing in their way are the high, unpredictable costs of existing methods and the logistical burden of handling winter-harvested ice. These plant owners are the target audience, and the book seeks to change them from traditionalists into proponents of modern, mechanical refrigeration. Through the proposed system, the labor force itself—the engineers, shipping clerks, and pullers—are seen as components in a machine, their daily tasks meticulously timed to ensure the plant runs at its maximum theoretical capacity. The authors intend for these business owners to emerge from the experience as leaner, more productive managers of artificial ice plants.

In Its Own Voice

"All authorities are agreed that artificial ice is more sanitary than natural ice and it is only a matter of time when the use of natural ice will be prohibited except in special cases when the purity of its source of supply is beyond doubt."

The authors use this assessment of public health to justify the necessity of investing in their mechanical systems.

"Our improved method of making artificial ice will cut the labor cost down to the minimum and will enable the manufacturer to profitably sell artificial ice at the price natural ice can be harvested."

This statement encapsulates the core promise of their proprietary patent, framing the transition as a sound economic move.

"We do not claim any wonders for our system but believe that the following points of advantage will convince any practical ice manufacturer that the labor cost has been cut in two."

This measured, grounded introduction sets the tone for the highly technical financial data that follows.

What It's Really About

At its heart, this book explores the industrialization of basic commodities. It asks a fundamental question: how can a labor-intensive, seasonal industry be transformed into a predictable, year-round mechanical process? The work treats the creation of ice as an engineering problem that, when solved with enough precision, can eliminate the reliance on the whims of nature. It reflects the early 20th-century belief in scientific management, where every motion of a worker and every unit of coal consumed could be measured, recorded, and reduced to a ledger entry. It is about the transition from a world of harvesting to a world of manufacturing, where the value of a physical good is defined entirely by the efficiency of the machine that creates it.

Why Read It Today

Readers with an interest in industrial history or the evolution of the "cold chain" will find this book fascinating. It is a rare, unadorned artifact from a time when the modern kitchen was still a novelty and the local ice plant was the backbone of domestic food storage. To read it is to step into the mind of a 1920s engineer who saw the world as a series of equations waiting to be solved.

There are difficulties for the modern reader: the text is dense with tables, figures, and calculations that require patience to navigate. It does not contain a traditional narrative or human-interest stories; it is purely a business and technical document. You will encounter the period’s attitudes regarding labor as a commodity, which provides a stark look at the power dynamics of the early 1900s workplace. However, the reward is a tangible connection to the past. The book captures the optimism of an age that believed technology could solve any problem and replace any natural limitation. It remains a poignant reminder of how fragile our modern conveniences once were and how much meticulous, manual effort was once required to keep a simple block of ice from melting.