Yea - as far as i understand it.
The outer L-a ring are periscope tics, where the decimals are the small divisions and the large divisions represented by 1, 2, 3, 4, 5 and 6
Next you have the B Scale (or L-b) that are masthead height on the ship you have ID'ed. Lets say a Kongo Class Battleship with a masthead height of 141 feet.
Say it covers one large and one small tick in the scope - giving 1.2 ticks.
Now turn the wheel so 141 is next to 1.2, then at the 2.0 mark (black triangle) you read the distance at the appropriate scale (C, D, E or F) depending on the zoom level. Currently im only using the x1 scale (C) as its unclear what zoom level the attack periscope is using. - In this case setting the Kongo at 1900 yards.
So :
OMH - Observed height in ticks on scope
MHH - Actual height of mast in feet
Allign OMH and MHH and read distance in yards next to 2.0 on the correct zoom scale.
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