The fine lead used in mechanical pencils has a diameter of about?
Share
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Answer:
Very thin leads appeared in 1939, and the first one had a diameter of 0.9 mm. Next were 0.3, 0.5, 0.7, 1.3 and 1.4 mm. Today we have 0.4 mm leads and even 0.2. Mechanical pencils today work on three principles.
follow my best friend
abidrizvi 5110
just click on my following option and follow her