I may not have gotten this 100% word for word, but I tried… I notice I can't find this in the searchable Q&A Transcripts...
Jeromy Walsh AKA Caspian is asked about Tinkerer’s on the DM21 Gaming May 31st 2016 Q&A - 58:43 into the video:
“Ah, potentially some irrigation systems, things like locks & safes & vaults. Ah, let’s see, ----- for shoes, clothing, sewing equipment potentially. Potentially like cages, a lot of these require work done by more than one group. Um, parts of some furniture, timepieces, potentially things like weather vanes & barometers, & thermometers.”
“Some of those are blacksmithing, but things like thermometers could potentially be tinkerers. Potentially some lighting systems & tools. Musical instruments, those are things tinkerers will typically create. So yeah, there’s things. In general if something has a moving part, or requires a gear or something like that, it’s often something a Tinkerer will make.”
“It might be that a blacksmith acquires the core resources & crafts the components, but then the tinkerer is the one that ultimately has to put those together.”
“I can also say that the tinkerer’s research is going drive I think a significant portion of the research that happens in the world overall. I think each of the different crafting professions have a reason to research, but I think the tinkerer’s is perhaps the most interesting.”
Bicycle Walrus asks a follow up question:
“I think if there’s going to be anybody who moves it towards a Steam Punk type feel, it will be the tinkerers, yes.”