I'd love to hear how people performed CPR in the 1700s. Did they have a clue what they were doing or were they just beating the Devil out of the man?
Jude was a member of a team of people who worked out compression frequency and breathing and then demonstrated that it worked on humans as an alternative to cutting them open and massaging their heart by hand.
Prior to that, people just blew air into you, then pushed on your chest to push the air out or moved your arms and chest around to get air in and out of your lungs. They didn't even think about trying to get your heart to beat for you, except maybe by accident.
It is impossible to enjoy idling thoroughly unless one has plenty of work to do. -- Jerome Klapka Jerome