Scanning Old Negative and Splicing

I would like to get a Canon LiDE 500F to scan some old
negatives. Unfortunately, almost none of them are 35mm.
Most are bigger.

Is it possible/practical to scan sections of them and then
splice them together?

 

I like the third one.
I have an old, old, scanner, so I'll give it a try on that one.

What it is doing, I think is "collecting" light so as to simulate a
light source
above the film. So, I believe the optimum arrangement would be to put a
sheet of paper over the film folded at a right angle with the hypotenuse
(wow,
haven't used that word in decades) 3 times the width of the film

/\
/ \
/ \
/ \
/ \
/ \
/ \
/ _____ \
A B C

Kind of like the above except with a 90 degree angle instead of 45 or
whatever.
A, B, and C are equal distances

Just a guess. Thanks for the tip.

 

What about 35mm slides? Do you have to take them out of the cardboard
carrier?

 

I tried the fluorescent flashlight trick described in two of the above
sites. Couldn't get it to work for me. Also could not find an email
address for 'Betty'. Got no response from one of the others.
Oh well....I tried.

Jethro