Einstein's Theories of Relativity and Gravitation: A selection of material from the essays submitted in the competition for the Eugene Higgins prize of $5,000

In Short

Compiled by Associate Editor J. Malcolm Bird from submissions to the Eugene Higgins $5,000 prize contest, this 1921 volume provides a guided tour through Albert Einstein’s special and general theories of relativity. Through selected essays and editorial commentary, the text demystifies four-dimensional space-time, the failure of the Michelson-Morley experiment, and the shift away from Newtonian mechanics. It has lasted as a primary historical landmark of science communication, capturing the precise moment when the broader public sought to grasp a fundamental paradigm shift in physics.

The Story

The book opens with an introductory framing by J. Malcolm Bird, who outlines the origins of the Eugene Higgins Prize essay competition. Bird explains that the average reader stumbles over relativity not because the core concepts are impossibly dense, but because laypeople lack the mental framework needed to receive them. Rather than opening immediately with the winning entry, the text deliberately leads readers through foundational principles to prepare their minds. It details the mechanics of the international contest, noting the flood of 120 submissions that arrived at the Scientific American offices on the final deadline morning, driven in part by foreign interest in the $5,000 prize amid post-WWI currency fluctuations.

From this editorial context, the narrative shifts into the historical and conceptual roots of classical mechanics. The text explores how physical science relied for two centuries on absolute space, absolute time, and an undetectable stationary frame of reference. Classical mechanics treated these imperceptible anchors like helpful, unseen ghosts. The narrative builds to a crisis with the 1887 Michelson-Morley experiment. Using the metaphor of a swimmer traversing a moving river, the text demonstrates why light beams traveling with and across the Earth's orbital path were expected to return at different times. When experiments repeatedly revealed no measurable speed difference, the search for absolute motion through an all-pervading ether broke down entirely.

The book then unfolds Einstein’s resolution: elevating this failure into a universal principle. The narrative demonstrates how the Special Theory of Relativity treats space and time measurements as completely reciprocal between observers in relative motion. To anchor these conclusions, the text incorporates Hermann Minkowski’s four-dimensional world of events, where time acts as an inseparable fourth dimension alongside three spatial coordinates. It rejects the idea that Euclidean geometry is the sole "true" geometry, presenting it instead as merely one convenient tool for mapping reality.

Finally, the text advances to gravitation and the General Theory, replacing absolute gravitational forces with geometry and reference frames. The argument culminates in three practical observational tests that confirm the theory over Newtonian dynamics: the 43-arcsecond per century advance in the perihelion of Mercury’s orbit, the gravitational bending of starlight passing near the sun, and the shift of spectral lines.

How It Unfolds

The vestibule of science The editor details the origin of the $5,000 Eugene Higgins Prize contest and establishes why lay readers must be gradually introduced to fundamental scientific concepts before tackling relativity.

The ghost in classical mechanics The text criticizes the traditional reliance on imperceptible concepts like absolute space and absolute time, comparing Newtonian mechanics to a house operated by invisible, benevolent ghosts.

The failure of the ether search Essays detail the famous 1887 Michelson-Morley experiment, illustrating through a river-swimmer analogy how attempts to measure the Earth's absolute motion through the light-bearing ether yielded purely negative results.

The Minkowski space-time continuum The argument merges space and time into a single four-dimensional continuum of events, demonstrating that space and time partitions vary depending on an observer's relative uniform motion.

The real-world empirical proofs The text evaluates the observational tests of the theory, proving its superiority over classical physics by accurately accounting for the long-unexplained 42-arcsecond anomaly in Mercury's orbital perihelion.

The People

Albert Einstein The theoretical physicist whose work forms the core focus of the book. Einstein seeks to formulate universal natural laws that hold true for all observers, regardless of their relative motion. Standing in his way are centuries of ingrained, "earth-bound" habits of thought and classical assumptions regarding absolute time and space. He emerges as the figure who successfully reconciles optics and mechanics by recognizing the relative nature of space-time measurements.

J. Malcolm Bird The Associate Editor of Scientific American who compiles, edits, and weaves together the contest submissions. Bird wants to make complex mathematical physics understandable to the general public without pitchforking readers into intricacies without preparation. He acts as a meticulous guide, curating text, adding footnotes, and reorganizing essay materials to construct a smooth narrative arc.

Hermann Minkowski The mathematician whose work provides the geometric framework for the Special Theory. Minkowski seeks a secure formulation to express the mathematical dependence between space and time. By introducing the four-dimensional world of events, he changes how science treats the time coordinate, transforming it from an independent variable into an integral part of physical reality.

Isaac Newton The foundational scientist whose classical laws of motion serve as the starting point for the entire debate. Newton sought an absolute frame of reference attached to the fixed stars to explain absolute motion, inertia, and gravitational forces. While his laws served physics for two centuries, his reliance on absolute time and flat Euclidean space is shown to be an incomplete description of the universe.

In Its Own Voice

"Now in Newtonian mechanics, absolute space and absolute time and force and inertia and all the other apparatus, altogether imperceptible, appearing only at the proper time to make possible a proper building up of the theory, play the same mysterious part as the ideas 'order' and 'regularity' in my story."

This quote appears in an early essay section illustrating why classical mechanics relies on unobservable abstractions to explain motion.

"The mathematician is the tool-maker of all science, but he does not make his own tools--these the logician supplies."

This sentence frames a discussion on the fundamental roles of logic, geometry, and mathematics in shaping physical theories.

"To locate an event we use four measures: $X$, $Y$ and $Z$ for space, $T$ for time."

This line introduces Minkowski's four-dimensional framework, where an event requires both spatial coordinates and a time stamp to exist.

What It's Really About

At its heart, the book is about shedding human perceptual biases to understand external reality. It questions the assumption that human sense-impressions and earth-bound habits—such as treating time as a universal clock or space as a rigid, flat grid—represent absolute truths. The text argues that physical theories and geometries are not inherently "true" or "false," but are human-made models judged solely by their ability to accurately describe physical observations. By replacing absolute Newtonian anchors with relative coordinates and four-dimensional space-time, the book demonstrates how scientific progress requires dismantling unexamined assumptions about how the universe operates.

Why Read It Today

This volume appeals to readers interested in the history of science, popular exposition, and the physics of space and time. It offers a rare look at how revolutionary ideas were explained to the public just as relativity was transforming science.

Reading the book feels like attending a structured lecture series led by early twentieth-century educators. The prose is calm, deliberate, and free of modern sensationalism. Complex ideas are explained using clever analogies, such as swimmers fighting river currents, haunted houses, and sliced blocks of movie film.

Readers should be prepared for period-specific elements. The text includes mathematical equations in TeX notation, references to historical monetary values, and detailed breakdowns of century-old astronomical measurements. It also retains structural editorial notes that explain how essays were spliced together. What stays with you is the book's core clarity: a reminder that the greatest obstacle to understanding new ideas is rarely the difficulty of the concepts themselves, but the challenge of unlearning old habits of thought.