Note 55 — PART II.
Reading edition
1⁄3200 of an inch; the Greek letter µ is the micro-millimetre, or 1000th of a millimetre, ·00003937 inch.
Reading edition
1⁄3200 of an inch; the Greek letter µ is the micro-millimetre, or 1000th of a millimetre, ·00003937 inch.