It's interesting that Baekeland's notebook uses Celsius instead of Fahrenheit yet modern American usage even in some engineering contexts uses Fahrenheit. See, for example, <a href="https://www.metabunk.org/attachments/174413923-28247782-carbon-steel-handbook-pdf.4544/" rel="nofollow">https://www.metabunk.org/attachments/174413923-28247782-carb...</a> where temperatures are given in Fahrenheit with Celsius in brackets afterward.