Proper Term For Spirit Level Protective Glass Disks

[John Baum]

Please educate me as to the proper name for the protective glass disks on a classic spirit level. Those who went before me never taught me during my 83 years this information and Dr. Google can’t seem to understand what I want.

I have a very solid 24-inch long classic cast aluminum spirit level made by Mays Bros. Manuf. Co. of Port Austin, Mich. It is missing two of its 1-7/8 inch diameter glass protective disks that appear to have been set using plumber’s putty made from linseed oil and plaster-of-Paris or perhaps plaster alone mixed thick enough to hold its shape.

I will try to add an image. It suggests that the level was made around 1927, so it is almost an antique.

Please educate me as to the part I want so I can try to purchase one.

MaysBrosLevel_120123.jpg

Thanks
John

[George Yetka]

Call Mayes Bros in Tenn @ 423-926-6171.

Supposedly they have parts for old stock

[Edward Weber]

I looked up what I thought was the proper name, I got the same results as you.
Google "watch glass" and or "beaker cover"
They come in many sizes
Hope this helps.

[James Pallas]

I believe the term you are looking for is vial cover.
Jim

[Bill Dufour]

On a dial indicator or watch "crystal". Sight glass may work as well.
Bill D.

[Bill Dufour]

You can cut sheet glass with tin snips. Mark a line with a sharpie and then do it underwater.
Bill D

[John Baum]

In every instance I wrote below Mays and not Mayes. I apologize. I could not find a way to edit the post I created.

John

My thanks, also to George Yetka for pointing out the successor company in Tennessee. I used the phone number to discover that the website can be accessed here:

https://www.greatnecksaw.com/

Under "measuring" the second entry, "levels" will take you here to see the current offerings.

https://www.greatnecksaw.com/247-measuring-tools/levels

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Please educate me as to the proper name for the protective glass disks on a classic spirit level. Those who went before me never taught me during my 83 years this information and Dr. Google can’t seem to understand what I want.

I have a very solid 24-inch long classic cast aluminum spirit level made by Mays Bros. Manuf. Co. of Port Austin, Mich. It is missing two of its 1-7/8 inch diameter glass protective disks that appear to have been set using plumber’s putty made from linseed oil and plaster-of-Paris or perhaps plaster alone mixed thick enough to hold its shape.

I will try to add an image. It suggests that the level was made around 1927, so it is almost an antique.

Please educate me as to the part I want so I can try to purchase one.

MaysBrosLevel_120123.jpg

Thanks
John

[Bob Wingard]

This is a sale for 6 lenses, but they are cheap ...

https://www.ebay.com/itm/35386873425...d2280539a2c2d5

[Tom M King]

I have a number of different brands of levels missing those glasses. Some are over 40 years old but still read an accurate level or plumb.

[Lee Schierer]

YOu can purchase glass discs from McMaster-Carr i 1-3/4" dia x 1/8" thick.

This person will custom cut glass discs Scroll down the page to see the thickness and ordering information

[Dwayne Watt]

I will try to add an image. It suggests that the level was made around 1927, so it is almost an antique.

This made me laugh out loud. I hate to be bearer of bad news but your level is an antique.