Church History Library: Archives and Collections: Collections
Goto the Collection and see if you can find photos of Joseph Smith and Emma, and Brigham Young.
My thanks to the Church History Library staff.
Here are two answers you can still practice by finding then and then find Emma:
12. Joseph Smith, copy of a photo, items 1-15
Stereoscopes
Goto a stereoscope photo (jump to example) and see if you can see the 3D image, three methods. Zooming once helped fill its window.
1. Center a dot above each image (two dots, for online use the edge of a no-lines piece of paper) and then relax your eyes to bring the two dots together (a 3D image and three dots); moving the image out from close (3ish inches) to your eyes can find your sweet spot.
2. Hold a 3×5 card on the line, relax your eyes (a 3D image and two dots).
3. With practice just relaxing your eyes will result in method 1.
For a better expiation Old-Time Fun: How To Make 3D Images For Viewing With No Glasses
