Dear Neil, I have a compact fluorescent lamp close to my lathe chuck so I can see what I'm doing. While using a digital caliper of the type on the cover of this month's MEW, it came near the lamp and I found that 10 mm bar had grown to 68 cm! A little experimentation showed that the lamp interfered with the caliper reading within a distance of 3 to 4 cm. Measurers bewarel A little light can go a long way......
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