digitalcarbon

@Pat Stanford I figured it out...Been using the built-in AI in my Skype to answer questions. Do you have any recommendation for an AI chat that can act as a research assistant?

I had a hunch from past observations. Pat, can you explain this to me? DIN is what I was lead to believe was the metric standard but then I stumbled into ISO 21.3 for example.

Can someone direct me to a chart that has Metric Pipe (Stainless Steel) Remember tubing and pipe are not the same thing. Also are Metric Pipes based on imperial pipe? Example DN 300 Pipe is (I'm told) is 304.8mm ID and 323.85mm OD. I was really hoping to have a clean break from the imperial muck & have DN 300 Pipe be 300mm ID and 324mm OD or some clean state. trying to build a library thanks

I'm assuming that this is the only way to do this? There use to be this hatch feature that would fill a polygon with hatch lines that you would need to clip...that tool still around? I had to make the hatch manually. Then create bands (the colors) to get to line up with tops and bots of windows.. Open to constructive criticism.

I do believe this is first angle, but they are more of a section of things...so how does that work?

paper constraints.

my unwitting 1st angle sketch

@propstuffThanks, I was wondering if it boils down to what works as to what is being drawn...the ship examples above have 3rd angle for the elevations and 1st for the plan to the broad side elevation. I just found a hand sketch of mine where I drew the elevation at the top of the paper (8.5x11) as that was the dominant focus and then drew a partial plan at the bottom of the page. which turns out to be 1st angle. If I had wider paper the other elevations would be in 3rd angle to the main. so I unwittingly worked it out similar to the people who did the boat drawings.

it seems like the top view of the boats (Chinese & Arabic) are 1st angle to each other as it is drawn as if the boat was rotated. Is that correct? Ok, so now I see where one would use 1st angle. As it would be silly to draw the plan above the sails and not directly under the boat elevation. Same with the Titanic. Upon closer inspection (note the blades) is seems that the elevation ends are 3rd angle and the plan is 1st angle.

Arabic, same as above. paper constraints. still readable.

Chinese, I think paper constraints had an effect on this. Still easily readable.

not really sure what was done here...too small to see unless I buy a print. Titanic

@Jeff PrinceThanks Jeff. it does not really answer the question. so I'll stick with the large objects people walk around and small objects people flip in hand. I would like to see a culture that actually would draw the house elevation example (show) above in 1st angle...not in todays cad as this is easy. but actual manual hand drawings. any pictures from antiquity? Heard that for the hydrogen bomb design they needed to make full scale drawings. People walked around on the paper in their socks. Then to see the whole thing they need to view it from balcony. Heard the same regarding airplane designs back then. Unfortunately I cannot find any pictures. I wonder what they did. I cannot imagine anyone (from any culture) walking across the room to draw on the other side of the paper. That would be a very long straight edge. I get metric I get dividing up a circle into 400 segments vs 360 You can find the history of how things developed on nearly every subject, but not this. If no one knows that ok. Just wanted to know.

I have the feeling that for big things a human walks around to the right and left so that is the way they draw. People mentally "walk" to the corner of the bldg on the paper and there is the elevation only a few inches away. One would not take their eyes that are focused on a bldg corner and move them to the other side of the paper looking for the adjoining elevation. The key word is "adjoining". But for hand held objects they can flip back and for without moving their body. I cannot believe someone sat down in history and after finishing a front elevation (see above) they then decided to place the right side of a building on the left of the paper (as show in one example above) and then showed friends and family who all said "yea, brilliant! I get it." Hence, without another rational explanation...and seeing that it needs to be rational (I hope it is) I will assume that it has to do with size of object in relation to the human body & what we hope to find when we take mental walks through our drawings.