https://en.wikipedia.org/wiki/Electric_chair
https://books.google.co.th/books?id=P31xDwAAQBAJ&pg=PA37&lpg=PA37&dq=T+thatcher+graves+hanging&source=bl&ots=zS3fOnuf1W&sig=ACfU3U3bRq6zkz-oOdsS9mMLBTmyCRb_wQ&hl=en&sa=X&ved=2ahUKEwjb58CF3_vpAhUu7HMBHcU6CboQ6AEwCnoECAoQAQ#v=onepage&q=T%20thatcher%20graves%20hanging&f=false
https://en.wikipedia.org/wiki/Hanging
https://books.google.co.th/books?id=FzayhpsWJ5oC&pg=PA171&lpg=PA171&dq=lewis+wilber+hanging&source=bl&ots=he8KpKi6cK&sig=ACfU3U2tR3qpvNEKuH_PqeKKosQQDBScxw&hl=en&sa=X&ved=2ahUKEwjZqL2X2fvpAhXh8XMBHTdBAakQ6AEwC3oECAwQAQ#v=onepage&q=lewis%20wilber%20hanging&f=false
https://connecticuthistory.org/gerald-chapman-americas-first-public-enemy-number-one/#:~:text=On%20October%2012%2C%201924%2C%20in,Main%20Street%20in%20New%20Britain.
https://www.publishersweekly.com/978-0-312-13500-3
https://en.wikipedia.org/wiki/Gerald_Chapman
https://worldwide.espacenet.com/patent/search/family/002610165/publication/US541409A?q=pn%3DUS541409
https://www.findagrave.com/memorial/85093110/t-thatcher-graves
https://history.denverlibrary.org/news/death-penalty-colorado-diy-death-machine
https://www.courant.com/courant-250/moments-in-history/hc-250-gerald-chapman-20140410-story.html