http://djm.cc/library/Calculus_Made_Easy_Thompson.pdf http://djm.cc/library/Calculus_Made_Easy_Thompson.pdf "from page 4: "one minute" - meaning a minute fract

http://djm.cc/library/Calculus_Made_Easy_Thompson.pdf http://djm.cc/library/Calculus_Made_Easy_Thompson.pdf "from page 4: "one minute" - meaning a minute fraction of an hour. When we required smaller subdivisions they divided each minute into 60 smaller parts they called "second minutes". i.e. small quantities of the second order of minuteness. Nowadays we just call these "seconds"!"