Hello,
I need help for different sizes in a hand.
After discussions I had about chalk slingstones with archeologists, I think it's possible that the size of several slingstones are measured with the hands. This is the hypothesis I want to study.
So I need your help to establish "an average hand".
All responses are welcome and a big thank you to all.

I agree with Teg -- modern people and their hands are much larger than than our predecessors.  You would do well to explore the studies of ancient humans -- Egyptians, Scythians, Greeks & Romans, Europeans etc.  Forensic anthropologists (or whatever they're called) will certainly have studied and recorded findings about body size, including hands.  A simple look at sword hilts from 1000 or more years ago tells you that hands were smaller 'back in the day'.

Always with my example, the median lenght is 5,4 cm. Second coincidence !
Yes, I'm not Hawaian and I didn't live in the XIXth century but I see two coherent coincidences.
My goal isn't to prove anything but to convince the archeologists that this hypothesis is interesting. Archeologists are scientist ; this is why an "average hand" is useful.
My idea may be stupid but if no one tries, we'll never know.

Hi, Blondsquirrel.
Thanks for the share. Useful and interesting.

In my photo, the 1st number is the lenght, the 2nd number is the width and the 3d number is the ratio width/lenght. The longer the lenght, the lower the ratio. It's normal because the width is almost fixed, about 2.4 cm.
My hypothesis :
1) Cut the diameter (1 phalanx on the index finger) in a pebble.
2) Cast off each end to obtain a projectile of about 3 fingers.
It's simple, fast and efficient to have identical slingstones. In addition, this method is easy to transmit to young slinger.
The photo attached to this post summarizes my idea.

In 1888, Vigors remarked that the slingstones used in New Caledonia had a diameter of exactly 2,5 cm (Kubikova, 2015).
The length of the middle phalanx of my index finger is 2,5 cm.
I just contacted the museum and I hope the visit will be possible.
Allow me to insist but the length of the middle phalanx of the index finger of many of you would be of great statistical help.
Thanks to all.

.

Yes, Joe Meadmaker.
I'm waiting for an answer from the museum, but it's closed in the winter.
The size of the human has varied according to the times. For example, I see on a French website that the size of a Neanderthal man was 1.60 meter. I measure 1.68 m.
https://www.hominides.com/dossiers/neandertal-et-sapiens-les-differences/
Therefore, some statistical data would be very useful to me to better understand my subject.
Thanks 

Thanks, Joe.
With your hands, you could have made the first bullet on the top left.


If I'm pessimistic, you are the only one who answered. If I'm optimistic, you are the first to answer. 
Your answers are important. Right or left hand, inch or millimeter ... like you want.