Message #49829

[forestman]

I'm adding the following because I have the information to hand.

I hadn't previously realised that glass bottles had the openings in the neck drilled to tidy up what would have been a less uniform opening left by the blowing process, whether it be free blowing or blowing into a mould. So I can now add all the glass bottles from the Bloch and Markovic collections to my previous figures.

From 550 glass bottles the sizes that occur the most are;

6mm     58 bottles
7mm     53 bottles
6.5mm   42 bottles
8mm      31 bottles
These four sizes account for 33.4% of the total number.

For 469 Jade, quartz, stone etc.

6mm      38 bottles
5mm      28 bottles
7mm      27 bottles
5.5mm    21 bottles
These four sizes account for 24.3% of the total number

Combine all these and there are 1019 bottles.

6mm       96 bottles
7mm       80 bottles
6.5mm    54 bottles
5mm       50 bottles
These sizes account for 27.5% of all the bottles.

As before I don't really know what use this is but it is surprising that the 4 most common sizes correspond to metric sizes and point to some consistency in the manufacture of drill bit sizes although the latter is to be expected.

Regards, Adrian.