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, https://www.metabunk.org/attachments/174413923-28247782-carb... where temperatures are given in Fahrenheit with Celsius in brackets afterward.
He was from Belgium, so the use of Celcius is very logical.
What I find fascinating is people on youtube who do actual chemistry, including making bakelite.