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Fractional numbers - Deutsch usage

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Frank:
Can anyone explain the usage of fractional numbers in the following, from a manufacturers description of their output?

Tafelglas, rheinisch 4/4, 6/4 etc. und deutsch 7/8,

Sklounion:
Rhineish single measure. Rhineish measure and a half, and Deutch being 1/8th less than that?
Mere speculation, sorry.
Regards,
Marcus

Ivo:
In German, a “Mass”  is a measure.

It could be anything from 0.5 to 2 liters.  Many localities had both an old and new Mass.

In Austria a mass equals 4 Seidel = 1.415 liters, a.k.a. a Kanne.

In Switzerland, a mass equalled 1.5 liters, a.k.a. a "pot". 1 Mass = 4 Viertelmass or Schoppen. 100 Mass = 1 Saum or Ohm.

1/4 = viertelmass
1/8 = achtelmass
these are used for beer and wine measures.

Many glasses used to have the contents noted on the rim in fractions; Decimal contents came much later. The standard drinking glass for wine in Austria and Croatia is called a "Dezi" - 0,1 liter

Frank:
Just seen this reply, thank you.

Also found a similar notation used for sheet glass viz:

Fensterglas in allen Stärken und Sortierungen, 4/4, 6/4, 8/4, 12/4.

and seemingly referring to "strength":

Both Window and Table glass referrred to "in 4/4, 6/4 8/4 Stärke"

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