The best instruments known are also due to the genius of Newton; it was he who had the first idea of adapting mirrors to those which serve to measure these distances.

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has the first idea

（ present singular third-person ）

having the first idea

（ participle present ）

had the first idea

（ participle past ）

had the first idea

（ past ）

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have the first idea

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have the first idea

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