Amazon.com : Astromania 1.25" Extendable Camera Adapter - for Either Prime-Focus Or Eyepiece-Projection Astrophotography with Refractors or Reflector Telescopes - Threaded for Standard 1.25inch Astronomy Filters : Electronics
How to View a Solar Eclipse: Make a Pinhole Projector
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Mary's Astronomy/Science Blogs: How To Observe The Solar Eclipse Safely Using Projection Methods
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Observing the Sun Safely: Sunspots, Faculae, and Flares - Sky & Telescope - Sky & Telescope
Solar Observing: Observing the Sun
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Projection: Pinhole & Optical | Solar Eclipse Across America
Baader Eyepiece Projection Adapter (I-VII) - David Astro
What is eyepiece projection and how do I do it? | BBC Sky at Night Magazine
A Compact, Lightweight Solar Projection Viewer - Sky & Telescope - Sky & Telescope