Bošković, Ruđer Josip
,
Abhandlung von den verbesserten dioptrischen Fernröhren aus den Sammlungen des Instituts zu Bologna sammt einem Anhange des Uebersetzers
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beynahe, multiplicirt abziehe, nämlich m r
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φ -
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{m r
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a/q
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}.</
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">Wird alſo der Werth des B I = r -
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{r
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m a/q
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- r
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(m φ + π)} ſeyn, allwo r die
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Brennweite der unendlich nahe bey der Achſe
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einfallenden Strallen, ohne auf die Dicke des
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Glaſes Acht zu haben, vorſtellet; </
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">{r
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m a/q
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} der-
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ſelben Verkürzung wegen der Dicke des Glaſes;
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">und r
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(m φ + π)} die aus der Oeffnung e ent-
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ſtehende Abweichung bedeutet.</
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<
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">Aus dieſer Formel kann
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man ohne Beſchwerde k, q und l hinweg brin-
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gen. </
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">Denn wir haben geſetzt, daß k = {1/a} -
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{1/p}; </
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">{1/q} = {1/a} - {1/m a} + {1/m p}; </
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">l = {1/b} -
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{1/q} = {1/b} - {1/a} + {1/m a} - {1/m p}. </
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">Nehmen wir
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nun an, daß {1/f} = {1/a} - {1/b}, ſo wird l =
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{1/m a} - {1/m p} - {1/f}, folglich wird {1/r} (das
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mit {1/b} - m l} gleich war) ſich in {1/b} - {1/a} +
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{1/p} + {m/f} = - {1/f} + {1/p} + {m/f} = {m - 1/f}
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+ {1/p} verändern, welches die Brennweite </
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