| 
         A shelf of "old library" books 
        organised into the sequence in which have been found in the library of 
        1691.  These volumes, being smaller (mostly duodecimo format), 
        would have been found on one of the upper shelves of the tier, with 
        larger books, quartos and folios on the lower shelves
 | Research to date suggest that each of the lettered sections (A, B, 
        C, etc, through to AZ) corresponds to a vertical tier of shelving, which 
        means that there were 46 tiers to start with; and, if working hypotheses 
        about the later addition of sections BA-BS are correct, another 18 being 
        added (or at least filled) somewhat later. Within each of these tiers 
        the books were arranged by size, in up to seven shelves. It is clear 
        that the shelves were numbered from the bottom, since the larger books 
        are in the lowest numbered shelves. In section AT the bottom shelf was at least 36 centimetres high, and 
        the total shelf height for the seven shelves in the tier was at least 
        142 centimetres; allowing for clearances and the thickness of the 
        shelves, we must assume that the tiers were about 2 metres high (not all 
        that different from Glasgow University Library now). At least some 
        shelves in the Library were considerably longer than modern Library 
        shelves: in Section AT they must have been at least 115 centimetres wide 
        (the modern standard is 90 centimetres). This implies very strong 
        shelves, and high cost, since apparently, the oak which would have been 
        the appropriate material was difficult to acquire in Scotland.  | 
         The shelving in the 1691 Glasgow 
        University Library was similar in height to current library shelving 
        (pictured) but wider and made of oak
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