This roll is composed of three membranes attached with glue.
The width of roll is 161 mm (or 6 3/8 inches) at the top of the roll. The width at the bottom of the roll is 158 mm (or 6 1/4 inches). The bottom edge of the manuscript is unevenly cut.
The total length of manuscript is 1528 mm (with membrane overlaps of 11 and 25 mm subtracted).
The first membrane is 622 mm (or 24 1/8 inches) in length. There is a 11 mm (or 3/8 inch) overlap, where the first membrane is on the bottom, pasted underneath the second membrane.
The second membrane is 555 mm (or 21 7/8 inches) in length. There is a 25 mm (or 1 inch) overlap, where the second membrane is on top, pasted on top of the third membrane.
The third membrane is 387 mm (or 15 1/4 inches) in length.
March 12, 2016 at 2:04 am
My two cents: it feels a little bit wordy — use parentheses, abbreviations, etc., to cut down on that. Also think about whether readers need both mm and inches.
I would also thing about reorganizing a bit. Length and width should be closer to the start; you might also list membrane lengths together rather than narrate each separately.