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To compliment my above post on sight radius, here's how the scopes started out over a century ago.
Their external adustments had a spacing of 7.2 inches. With the same tooling making the knob's threads also 40 tpi and the sprung ball detents making 50 clicks per revolution, each click moved the back mount's adjustment flats exactly .0005". With 1/3600th of 7.2 inches being .002", four of those clicks moved the scope 1 inch at 100 yards. Some scope bases were mounted 10.8 inches apart giving 6 clicks per inch at 100.
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