What I did was this:

I drew the rectangle ABCD in perspective using the measurements given above. I then drew E-F which is 7.5mm from A-B which represents the graduation at 1cm. I could have chosen any distance but have decided to use the value from the photograph.

I then drew a line from B through the mid point of E-F.

I extended this line to intersect the line A-D. I then drew the line G-H.

I repeated this until I had all the divisions marking the graduation of the ruler.

You

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