1910 New Catholic Dictionary
Those which the Roman pontiff attaches to pious articles, such as crucifixes, rosaries, and medals, when he, or one authorized by him, blesses them. Painted or printed pictures, and crosses and crucifixes, etc., made of pewter, iron, lead, or fragile material, are excluded. The blessed article must be carried on one's person, if possible, otherwise kept in a suitable place, and the prescribed prayers recited.
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Entry for 'Apostolic Indulgences'. 1910 New Catholic Dictionary. https://www.studylight.org/dictionaries/eng/ncd/a/apostolic-indulgences.html. 1910.