Jacob Green and Erskine Hazard, identifying themselves only as “Two Gentlemen of Philadelphia,” published this compact manual in 1809, a time when electrical science was rapidly expanding. The authors adopt a direct, instructional voice, addressing readers who seek a working knowledge of electricity and galvanism without wading through extensive treatises. The book’s motto from Ovid—Causa latet; vis est notissima (the cause is hidden; the force is well known)—signals a focus on observable effects and practical utility rather than theoretical speculation. Three professors from the University of Pennsylvania, the College of New Jersey, and Yale College contributed endorsements, praising the work’s clarity and suitability for youth and general readers.

A Manual Built for Instruction

The authors structure their epitome as a teaching tool, moving systematically from basic concepts to applied techniques. They define electricity as a fluid that can be transferred, accumulated, and discharged, and they describe the Leyden jar, the electrophorus, and the electrical machine with precise, step-by-step instructions. For instance, they explain how to measure a shock’s intensity by the distance between the electrometer’s ball and the jar’s knob: “when the shock is large it will pass from one knob to the other at a larger distance.” This emphasis on measurable, repeatable procedures reflects the authors’ pedagogical aim. They also include warnings about handling equipment safely, such as using a glass tube as an insulating handle when drawing sparks from a patient’s ear.

The Electrical Physician’s Toolkit

A substantial portion of the text is devoted to medical electricity, detailing instruments and methods for treating ailments. The authors describe a “bottle director,” a modified Leyden jar with a hook at the bottom, used to direct shocks through specific body parts. They also recommend a ball “either of metal, or of wood covered with tin foil” for drawing sparks, and a wooden point for applying a continuous stream of electricity. The language is practical and prescriptive: “The next thing to be provided is a ball… this must have a metallic handle.” The authors present these tools as part of a systematic approach, with four graded applications: simple insulation, friction, sparks, and the stream. Each method is linked to particular conditions, such as spasms, cutaneous eruptions, or deafness.

A Case Study in Treating Deafness

The authors include a rare first-person clinical account, describing their treatment of a gentleman who had suffered “an almost total loss of hearing for more than six months.” They placed him on an insulated chair connected to the prime conductor and, using a blunt pointed wire inserted into a glass tube, drew sparks from the meatus auditorius for eight to ten minutes per session, two or three times a week. After four or five weeks, the patient “left us almost entirely recovered.” The authors note their belief that more frequent sessions would have hastened the cure. This anecdote, presented without statistical context, illustrates the empirical, case-based reasoning common in early 19th-century medical writing. The authors do not claim universal efficacy but offer the episode as evidence of electricity’s potential.

Diction and the Rhetoric of Certainty

Throughout the epitome, the authors employ a confident, declarative style that minimizes hedging. They state that “electricity thus applied has often removed violent spasms” and that deafness “has been entirely cured by the electric spark, when every other remedy has proved ineffectual.” Such assertions are tempered only occasionally by phrases like “it may be suspected that so gentle a treatment could have but little influence.” The vocabulary is technical but accessible: terms like “prime-conductor,” “electrical stool,” and “metallic handle” are used without elaborate definition, assuming a reader familiar with basic apparatus. The authors’ choice to publish anonymously, yet include endorsements from prominent academics, suggests a desire to establish credibility while keeping the focus on the science rather than the authors’ reputations.

Readers approaching this 1809 epitome should expect a concise, hands-on guide rather than a theoretical treatise. The authors’ emphasis on practical application—especially in medical contexts—reflects the era’s optimism about electricity’s therapeutic potential. The book rewards attention to its detailed descriptions of apparatus and procedures, which reveal how early practitioners translated laboratory discoveries into bedside treatments. For those interested in the history of science and medicine, this work offers a vivid snapshot of electrical practice in early America.