Ya'll are determined to make me work.
Todd "being first duly sworn" -- clear enough
"deposes" -- indicates a statement, oral or written, under oath
"Sworn to before me and subscribed in my presence" -- sounds like he swore to it to me.
As an interesting sidenote, notice the retro language in the 1954 Ohio affidavit: "Further affiant saith not." I have always ended my Mississippi affidavits: "Affiant further saith not."
I am not judging here, simply observing that we do not have, as I always thought, an Affidavit signed by 30+ observers. For instance Wiki reports it like this "[a] handwritten and notarized affidavit[11] with the signatures of more than 35 eyewitnesses exists as proof of this feat." But this is false.
Here's more on dates. Wiki reports the run was on the 19th and 20th. Signatures were collected on the 19th. How do you certify something that is not yet complete? Affidavit not executed until six days later? Note, the only date on the affidavit is above the Notary's signature. This is when it was executed -- it might have existed, unsigned by Todd and not notarized, for days before. THE DEVIL IS ALWAYS IN THE DETAILS.
It does appear that the notary on this affidavit did more than just make an "acknowledgement" of identity, and that he also administered an oath.