No. 12 (2025): Issue № 12
On the Cover – Mining operations using an electric Gram motor.
Sources: Soulages C.-C. Application de L'électricité au Percement des Galeries Souterraines. – La Lumière Électrique, 1883, No. 49, pp. 459.
Dinamomashina v ee istoricheskom razvitii. Dokumenty i materialy (The Dynamo in Its Historical Development. Documents and Materials) / Comp. D.V. Efremov, M.I. Radovsky; Ed. by Academician V.F. Mitkevich. L.: Izd-vo AN SSSR, 1934, 560 p.
155 years ago in 1870, the Belgian electrical engineer Zenobe-Théophile Gramme received a patent for a DC generator. This machine combined several of the latest achievements of the time. Soon, the Gram Company organized the mass production of DC generators and motors, which found wide application in industry. The figure shows a "hammer drill for mine galleries" with a Gramme design motor.
