Mesorat%20hashas for Eruvin 4:2

פַּעַם אַחַת לֹא נִכְנְסוּ לַנָּמָל עַד שֶׁחֲשֵׁכָה. אָמְרוּ לוֹ לְרַבָּן גַּמְלִיאֵל, מָה אָנוּ לֵירֵד. אָמַר לָהֶן, מֻתָּר אַתֶּם, שֶׁכְּבָר הָיִיתִי מִסְתַּכֵּל, וְהָיִינוּ בְתוֹךְ הַתְּחוּם עַד שֶׁלֹּא חֲשֵׁכָה:

Once, they did not enter the harbor until dark. They asked R. Gamliel: "May we go down?" [from the boat into the city, or did we come from outside the tchum after dark? (This harbor was not partitioned; for if it were, R. Gamliel has already said above that if one were placed into a (fenced-off) enclosure or corral, he may walk in all of it.] He answered: "You may do so, for I already looked [through my telescope, adjusted to a two-thousand cubit range], and (found that) we were within the tchum before it had gotten dark."

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