Applied for British Patent No. 21,640

Guglielmo Marconi, a pioneer in wireless communication, applied for British Patent No. 21,640, focusing on advancements in wireless telegraphy apparatus. This application was part of Marconi's ongoing efforts to enhance the technology that would eventually revolutionize long-distance communication. His earlier work, including the acquisition of Patent No. 7777 for tuned or syntonic telegraphy, laid the groundwork for these improvements by addressing issues of selectivity and interference in wireless signals. The innovations introduced in Patent No. 21,640 aimed to further refine the efficiency and reliability of wireless telegraphy, which was becoming increasingly vital for maritime and military communications. Marconi's contributions were instrumental in establishing the framework for modern wireless technology, influencing both commercial and personal communication methods.