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Patent Exhibit of Electromagnetic Coil – T-H Electric Co. vs. Nassau Electric Railroad Co.

Drawing
This is a technical patent exhibit drawing featuring three labeled diagrams (Figures 1, 2, and 3) that illustrate the structure and function of an electromagnetic coil. The document contains handwritten notes and legal case references, indicating its use as an exhibit in a court case regarding an electrical patent dispute. The top-left section includes details about the court case, which involved: U.S. Circuit Court, Eastern District of New York T-H Electric Co. vs. Nassau Electric Railroad Co. Patent date: February 23, 1897 The top-right section contains handwritten text, identifying it as: "Complainant's Exhibit" "Bentley Figures 1-6 Bk. & Spec. Dec. Feb. 21, 1899"
Patent Exhibit of Electromagnetic Coil – T-H Electric Co. vs. Nassau Electric Railroad Co. picture number 1

Lewis Latimer’s diagram for an 1899 lawsuit demonstrates the skill and precision of his mechanical drawing. Along with his other gifts, Latimer’s draftsmanship repeatedly opened doors for him—with Hiram Maxim, the Edison Company, his later employers Hammer & Schwarz, and various private clients.This document is likely part of a patent dispute case involving electromagnetic coil technology, which was critical in the late 19th-century development of electrical infrastructure, including electric railroads, motors, and transformers.

Latimer Family Papers (1870-1996 ) [QPL Full Collection]

Printed text (top-left corner): U.S.C. CT., E.D. OF N.Y. T-H Electric Co. vs Nassau Elec. R. R. Co. Patent - 2.23.97 Handwritten text (top-right corner): Complainant's Exhibit Bentley Figures 1-6 Bk. & Spec. Dec. Feb. 21, 1899 Labeled Figures: Fig. 1: A straight bar with a coiled wire wrapped around it, labeled "A." Fig. 2: A helical coil with labeled A and directional magnetic field indicators. Fig. 3: A tightly wound coil with field lines radiating outward, likely representing an active electromagnetic field.