S.L. MacGregor Mathers and Aleister Crowley, The Lesser Key of Solomon, 1904:

This is the Form of Pentagram of Solomon, the figure whereof is to be made in Sol or Luna (Gold or Silver), and worn upon thy breast; having the Seal of the Spirit required upon the other side thereof. It is to preserve thee from danger, and also to command the Spirits by.

William Thomas and Kate Pavitt, The Book of Talismans, Amulets and Zodiacal Gems, 1922:

Solomon's Seal, also known as the Interlaced Triangle, is another ancient Talisman that has been universally used in every religion; but though it is said to have been the symbol by which the wise King ruled the Genii, it could not have originated with him as its use dates back much further than the Jewish Dispensation.

As a Talisman it was considered all-powerful, being the perfect sign of the Absolute, and was worn for protection against all casualties, dangers, and mischief, and to preserve its wearer from all evil.

In its composition the Triangle with its apex upwards symbolises Good, and with the inverted Triangle, Evil: the Triangle with its apex up being typical of the Trinity that exists in all religions; in India, China, and Japan its three angles represent Brahma, Vishnu, and Siva, the Creator, Preserver, and Destroyer or Regenerator; in Egypt it represented Osiris, Isis, and Horus, and in the Christian Church the Holy Trinity. As a whole it stood for the elements of fire and spirit, composed of the three virtues, Love, Truth, and Wisdom. The Triangle with its apex downward represented the element of water, and typified the material world, or the three enemies of the soul, the World, the Flesh, and the Devil, and the cardinal sins, Envy, Hatred, and Malice.

Therefore, the meaning of the two Triangles interlaced, is the triumph of spirit over matter, and at the commencement of our present civilisation was considered an all-powerful Talisman[...]"

R. O. Winstedt, Shaman, Saiva and Sufi: A Study of the Evolution of Malay Magic, 1925:

"The hexagonal star of Solomon's seal is used by Malays to cure madness and possession by devil, familiar spirit, ghost or genie. In Perak three such stars are drawn on paper that is steeped in water for washing the face of one afflicted with dizziness.

Washington Irving, The Alhambra, 1894:

"The device consists of two equilateral triangles, interlaced so as to form a star, and surrounded by a circle. According to Arab tradition, when the Most High gave Solomon the choice of blessings, and he chose wisdom, there came from heaven a ring, on which this device was engraven. [...]

The signet of Solomon the Wise, for instance, is well known to have held potent control over genii, demons, and enchantment; now who will positively assert that the same mystik signet, wherever it may exist, does not at the present moment possess the same marvellous virtues which distinguished it in the olden time? Let those who doubt repair to Salamanca, delve into the cave of San Cyprian, explore its hidden secrets, and decide."