(~1743 - 1799)
Christian William Anthony Katterfelto (known as Gustavus) was a Prussian conjurer, scientific lecturer, and quack. He moved to Britain in 1776 and stayed there until his death. He typically performed with a black cat he called "evil". He used the flu epidemic of 1782 to profit as a quack and thus he added a medicine show to his conjuring performances. He used a solar microscope to show images of microbes which he claimed were the causes of the flu.