BCAL Pb Sheet Widths Revised

I have updated the values from George in BCAL Pb Sheet Widths to account for 180 layers per module (rounded up from 179), and combining step 4 with 2 and 3. We get the following per module:

• 20 sheets of 13.0 cm width (step 1)
• 60 sheets of 12.0 cm width (steps 2, 3 and 4)
• 60 sheets of 11.0 cm width (steps 5, 6 and 7)
• 40 sheets of 10.0 cm width (steps 8 and 9)

In the spec, I suggest we order enough for 50 modules (i.e. 49 + 1 spare).