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In page Slaughterhouse:

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Attempts were also made throughout the British Empire to reform the practice of slaughter itself, as the methods used came under increasing criticism for causing undue pain to the animals. The eminent physician, Benjamin Ward Richardson, spent many years in developing more humane methods of slaughter. He brought into use no fewer than fourteen possible anesthetics for use in the slaughterhouse and even experimented with the use of electric current at the Royal Polytechnic Institution.[5] As early as 1853, he designed a lethal chamber that would gas animals to death relatively painlessly[citation needed], and he founded the Model Abattoir Society in 1882 to investigate and campaign for humane methods of slaughter.