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Gary, Egg pointed out the issue was with the htmlclass Name.

The simplest code becomes:

Acorn

Gary, XDPX19 possibly is working as you have used jQuery in the design. Hard to check as I do not have (or want) XDPXv19, but it could be serendipitous if that is the case.

The proper firing up of...

Thanks again Egg for the inspiration.

Try:
<script>
var images = [].slice.call(document.querySelectorAll('.photo')).slice(1, 100);
var showtime = 1000;
var carousel = {
targets: images,
...

Thanks Egg, I've tried a circular 400px dia reveal with:

<style>
.photo {
opacity: 0;
transform-origin: 0 0.5;
}
</style>
<script>
var showtime = 3000;

This is a very simple but versatile slider.
I do, however, need to work out why I have to add an SVG shape to trigger it to work.

I have a collection of boxes with a Bitmap Fill of each image....