Sorry for digging up an old thread; I'm a bit behind on my reading! ... The date of introduction of the small angle scale must have been earlier than 1925, Ineil_l_jackson
Hi David, I suspect it has to do with the division of the circle into milliradians or an approximation to that. I don't know all the in's and out's of this,dfsmth45
I’ll have to check. Please send me your email address so that I can respond off-group. Thanks. Dick Dick Rose Email:dickrose2
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