‘I really have a secret satisfaction in being considered rather mad.’ The name of William Heath Robinson has entered the national vocabulary as a by-word for eccentric inventions and makeshift solutions – and with good reason. His world of cogs, bits of string, magnets and precarious tipping points holds a universal appeal. Whacky machines and bemusing solutions to everyday problems are brought to life in this hilarious collection of cartoons from Heath Robinson. From wart removers to potato pee…