294 King Tiridates was converted by Gregory the Illuminator and adopted the Christian faith.
Gregory the Illuminator (Rivingtons, 1868).
The objects observed with the vertical illuminator must not have a glass cover if the dry system is employed, because the upper surface of the glass cover would send so much light back into the objective by reflection, that the image would be indistinct.
GREGORY THE ILLUMINATOR, the reputed founder of the Armenian Church.
1 On the other hand, the globe is made gay with flags and other decorations, the work of George Glockendon, a well-known illuminator of the time.
The battle in which the sultan of Rum (1243) was defeated by the Mongols took place on the plain, and the celebrated Armenian monastery of St Gregory, "the Illuminator," lies on the hills 11 m.
In the 4th and 5th centuries may be mentioned Gregory the Illuminator, the " apostle of Armenia " (about 300), Ulfilas, the " apostle of the Goths," about 325; Frumentius, 1 a bishop of Abyssinia, about 327; Nino, the Armenian girl who was the means of converting the kingdom of Iberia (now Georgia), about 33 0; 2 Chrysostom, who founded, at Constantinople in A.D.
It has often been said that he commenced and frequently practised as an illuminator; this is dubious and a presumption arises that illuminations executed by Giovanni's brother, Benedetto, also a Dominican, who died in 1448, have been ascribed to the more famous artist.
It was not until some time after his death that the enemies of his son first alleged that he was not of the family of La Scala, but was the son of Benedetto Bordone, an illuminator or schoolmaster of Verona; that he was educated at Padua, where he took the degree of M.D.; and that his story of his life and adventures before arriving at Agen was a tissue of fables.
Before the partition, Tiridates, converted by St Gregory, " the Illuminator," had established Christianity as the religion of the state, and set an example followed later by Constantine.
Much more easily manipulated is the parabolic side-illuminator invented by R.
To examine objects with objectives of high power and low free object distance, the apparatus for side-illumination is not sufficient, and a so-called vertical illuminator is used.
- Vertical suitable adjustment and by changing Illuminator (Zeiss).
It is, on the contrary, possible to examine covered objects with the vertical illuminator, if the immersion system be employed.
Stephenson's catoptric illuminator (1879), may also be mentioned.