Crystallography, stereographic projections, Lecture 3 of 9

An introduction to stereographic projections and their applications, the Wulff net and methodology.
Associated teaching materials can be found on:

H. K. D. H. Bhadeshia

[schrodinger]

Dear Prof.,
I think, in the slide at 18:17, the (110) plane should be parallel to the Z axis, but it's parallel to the x axis, so it is the (011) plane.

[很用心]

A very explicit interpretation of the application of the Wulff net! Thank you so much! 😊

[MuhammadNadeem-pkre]

Dear sir thank you very much. Really much informative this lecture was.Thumbs up!

[juheekim]

Thank you for your detailed description, sir! I think this video is really helpful to many MSE students.

However, I didn't understand one thing, so I want to ask a question. At 9:13, you said that the pole (the black dot in fig. (d)) will be at 90 degrees to every point of the trace. I didn't understand why the point is vertical to the trace line.
I understand that the pole of [011] is perpendicular to the plane (011), but why is it perpendicular to the trace on the equatorial plane?

[SohrabF]

Sir, first of all, many thanks and appreciation for sharing your beautiful knowledge here. Then, is the indices of the blue pole at 15:33, [111]?

[fakhryhatta]

why do we have (111) trace plane (31:56) different from the (111) trace plane in 19:08

I still confuse with the meteorite sample actually Prof. Please give me any clue or more explanation. thank you before

[franciscocanillas]

you're an angel 🥲 thank you so much

[hikguru]

Hello Dr. Bhadeshia. At the 19:29 mark a pole is marked as one, one bar, one bar on the top left quadrant. Should it not be one bar, one bar, one instead? Thx.

[sushantsawant]

Which software are you using for such geometry? If it's multiple software can you make video on same?