Making Spectacles From Scratch

Discussion in 'Back to Basics' started by chelloveck, Jul 30, 2018.

  1. chelloveck

    chelloveck Diabolus Causidicus

    Here are a couple of Youtube clips on making spectacles from scratch.....

    AS you will have seen....having spare spectacles is much easier than making them from scratch from raw materials. I am fortunate in being slightly long sighted...I can get by with magnifying spectacles for close range work.
    Zimmy, SoaySheep and Sapper John like this.
  2. SoaySheep

    SoaySheep Monkey

    after heating in the kiln for several days...
    I wonder how much glasses cost in 1800 if compared to today's money
    3M-TA3 likes this.
  3. 3M-TA3

    3M-TA3 Cold Wet Monkey Site Supporter++

    The classic way to grind a lens uses two round glass blanks. the lower blank is spun while the top blank is moved across and back at a regular rate. Some sort of abrasive fluid is used between them. Over time one will be come concave and the other convex. There used to be a great video on this, but I can't find it. This one uses one preformed blank and a piece of ceramic to polish it in orcer to make a telescope reflector, but follows the same basic process:

    And this one shows the same process with manual rotation by periodically moving the glass blank. Seems you could use a treadle type pottery wheel if you needed rotation but didn't have power.
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