http://creativeandchaos.com/2012/04/04/typography-before-computers/
http://www.graphic-design.com/Type/history/
http://bellsouthpwp2.net/b/c/bcarberry/tp.html
http://commfaculty.fullerton.edu/woverbeck/dtr6.htm
Short answer: by hand, photographing each gliph one at a time.