Saturday, October 26, 2024

French made Jewelers calipers


The internet says these are used to measure the weight of a gemstone. I would think they take a linear measurement (the scale is probably millimeters) which would then be translated into weight using a chart. 



 

at

2 comments:

  1. JPOctober 27, 2024 at 2:24 AM

    Optician's lens caliper.

    ReplyDelete
  2. Mister GOctober 28, 2024 at 4:57 PM

    Yes, I see them called that too. It's not a form of calipers I'm familiar with.

    ReplyDelete