Google Sites - Using the Slider Gadget
New/Google Slides
File/Page Setup/Standard 4:3
Create the slides
File/Publish to the web
Check the Start and Restart box
Copy the link
Open a web page on Google sites
Edit the page. Insert More Gadget/Slideshow maker
Page the link
Save
Uncheck the Include border
Width: 100, Hight: 300
OK
Save