Assembling the NGC was a challenge, as Dreyer had to deal with many contradicting and unclear reports, made with a variety of telescopes with apertures ranging from 2 to 72 inches.
彙編NGC是一個挑戰，因為德雷爾不得不處理許多矛盾的和不明確的報告，與各種從2至72英寸孔徑範圍的望遠鏡作出的報告。