Porter Garden Telescopes :
 Earliest numbered example
 Reproduction effort by Telescopes of Vermont (I am not affiliated with this)

Dave Groski's Solar Page :
 Main page

Mirrors of Dave Rowe's pages "
 drowesmi
 aplanatic

Webpage documenting the construction of a brickoven for baking, pizza, etc. :
 Main page

The life work of Walter J. Semerau (incomplete) :
 Article

Digital pictures of copies of original blueprints for Hale's spectrohelioscope (each is about 200Kb) :
 image 1
 image 2
 image 3
 image 4
 image 5
 image 6
 image 7
 image 8
 image 9

Pictures of pieces of a Hale spectrohelioscope :
 image 1
 image 2
 image 3
 image 1
 image 2
 image 3

"English Mechanic" :
 Brashear contributions
Mirror of Dave Rowe's Spherometer page
 Making and using a three-ball spherometer

John M. Pierce mirror grinding and telescope making articles :
 Articles by John M. Pierce, from "Science & Mechanics," 1933-1934 and elsewhere