A benefactor to mankind? Captain Warner's secrets and the politics of invention in early Victorian Britain.

This article delves into Captain Samuel Alfred Warner's dogged campaign to sell two inventions - his submersible mine and "long range" missile - to the British government in the 1840s and 1850s. Departing from a historiography that dismisses Warner as a fraudster, it clarifies how he managed to generate widespread interest in his weapons technologies for nearly twenty years. I therefore analyze three key elements of his self-promotion: his personal branding, his pitch, and his simultaneous embrace and rejection of publicity. Neither elite nor highly educated, Warner ran up against a culture of "polite science" that distinguished disinterested practitioners from profit-minded schemers. To establish his credentials, he emphasized his practical maritime experience and represented himself as a martyr willing to bear the scorn of a disbelieving establishment. In pitching his devices, Warner capitalized on alarmism over border security and the integrity of the empire; he declared that they could hobble France's modernizing navy and quickly end colonial conflicts. When skeptics began to fret over the proliferation of his destructive weapons, Warner flipped the script and lauded the threat of mutual annihilation as a deterrent to needless warfare. The issue of publicity, however, would ultimately be Warner's professional undoing. Despite successful demonstrations, his clashes with official investigators and his refusal to disclose his chemical secrets led critics to dispute the originality of his discoveries. An examination of Warner's self-promotional strategies, his fraught interactions with the British state, and the ambivalent public reaction to his contraptions provides insight into how scientific authority was acquired and lost in this period.