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Hidden Message Egg (wine glass magnifying lens)

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For many years my family makes and displays Easter eggs. I try to do something different every year.

This year I wanted to combine a hidden message inside the egg; readable with an attached homemade glass magnifying lens.

I got the idea from micro-pictures put inside walking canes, rings, lockets which are only visible by either a Stanhope or Dagron lens.

I cut down a wine glass for the lens material and create a modified Plano-convex lens.

 
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Step 1: Items Used

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Items used

1. Egg – white chicken egg

2. Glue gun

3. .005 fine black marker

4. Wine glass

5. Bamboo sticks – for grinding the glass to make lens

6. Wet grinders or paper 100,220,400,600,1000,3000

7. Polishing compound – cerium powder mixed with water

8. Diamond cutting wheel

9. Large metal paperclip

10. Household scissors

11. 20 pound white paper

12. Tweezers – I used a plastic jaw for handling the lense and a small jaw for putting the message in the egg

13. Color markers – to decorate outside of egg

14. Egg holder - I used a large spring clamp

15. Safety gear

Always remember shop safety - wear your protective items

Step 2: Make the magnifying lens (This lens is called plano-convex)

Picture of Make the magnifying lens (This lens is called plano-convex)
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I started by cutting a wine glass into little pieces ( I used a wet diamond saw).

I then mounted the broken glass onto pieces of bamboo (to work on the grinders)

Using wet grinders, I worked from 100, 220, 400, 600, 1000 to 3000 grit; to shape and polish the lens.

I used cerium polish to put on the final finish on the lens.

I created a lens with one of the surfaces flat, and the other curved out.

This (wine glass magnifying lens) lens is called plano-convex

Step 3: Prepare the egg

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Poking a big hole and a little hole in an egg.

It was blown in the little hole - blowing out the contents thru the big hole.

I let it dry for a few days.

hunter9992 months ago

Haha, this is an egg-cellent idea! ;-)

Fikjast Scott (author)  hunter9992 months ago
well said, thank you
cupquake3 months ago
Your mom must have been a painter i love the multicolored egg on the top right corner
Fikjast Scott (author)  cupquake3 months ago
thank you for the nice comment,
caitlinsdad3 months ago

I know it is not precision optics but is there a certain curve you have to put on the round part of the lens? I'm guessing you have to really peer around all sides to view the message or is that all in focus in the field of view?

Fikjast Scott (author)  caitlinsdad3 months ago
Well, there are some size ratios on the internet for simple lenses. Keep in mind that the thickness of the wine glass pieces will be fixed. So when you do your ratios, you will already know the thickness. I decide on my size ratios and started grinding. I first grind towards the outer diameter size I need.
As far as the curve I make a 45 degree grind from the edge and then a 60 degree grind from the middle of the 45 angle. Do this with your 100 grit then move onto the 220 grit. This creates the curves main shape. Move onto other grits (400 and up) and polish using a spinning and rocking motion. This will knock off the sharp edges. Never stop in one place or you will get a flat spot, keep the lens moving at all times when grinding or polishing. This will give you a nice dome.
Please note glass cuts fast, so use lots of water.
Since I am doing this free hand I get mixed results (not precision). I make a few extra and take the best for my project or I need to go back and regrind for better results...
The style of lens helps out in getting to your magnifying goals - concave vs convex etc...
I really struggled with the focal length. Viewing through the lens on the egg the message is directly across, not a lot of searching required. You should have seen my back up design for a moveable message to put it in focus. I am glad I did not have to go with the backup design.
I selected the wine glass because of the clarity. For cheap clear glass it works out well.
My thought is that I can at least make a lens as well as the early inventors. So, I guess I just try and do my best.
More questions as you try this, just let me know. I will try to explain it again. Scott

Thanks, maybe one day I will chip apart an old pair of prescription glasses to grind some tiny lenses.

rimar20003 months ago

Like your lens!

Fikjast Scott (author)  rimar20003 months ago
Thanks, I like making them.
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