In addition to the globes of Mercator referred to above, it is known that after taking up his residence in Duisburg he constructed a small celestial globe of glass, on the surface of which he engraved with a diamond the several constellations, and that he likewise constructed a very small terrestrial globe of wood, apparently such as were later called pocket globes, having all geographical records given as accurately presented as on the larger globes.[283] How great was the direct influence of Mercator on globe making activities, it may not be easy to trace, but the evidence seems to be conclusive, as Breusing has noted, that his should be counted the greatest, among those active within this field, for fifty years and more, following the issue of his first work in the year 1541. It is among the Italian globe makers, and those in the peninsula interested in such instruments, that we seem to find the first and most striking evidence of his influence, which will be noted in the following pages. Giovanni Gianelli of Cremona is referred to, by certain early Italian writers, as a clock and globe maker of remarkable ability,[284] the justice of which estimate is abundantly supported by the character of the one example of his handiwork extant, belonging to the Biblioteca Ambrosiana of Milan, to which it came from the collection of Canon Manfred Settàla about the middle of the seventeenth century. This is an armillary sphere of brass, the diameter of its largest or zodiacal circle being 14 cm. This circle is graduated and has engraved on its outer surface the names of the twelve constellations. It is likewise provided with a graduated equatorial circle, with polar circles and those representing the tropics. At the common center of the several rings is a small ball, 5 cm. in diameter, which is made to serve as a terrestrial globe. On one of the circles is the inscription “Janellus MDXLIX Mediolani fecit,” and we further find inscribed the name “Hermetis Delphini,” which perhaps tells us of a one-time possessor. In a volume describing the museum of Canon Settàla, and issued in the year 1666, Gianelli and his work are thus referred to: “To that great man Gianelli of Cremona there is due great honor, whose personal qualities made him an especial favorite of His Catholic Majesty Philip II. Among the many globes which he constructed our museum possesses one of surpassing excellence, in that it exhibits, in addition to other movements, that which astrologers call the movement of trepidation, and which movement was set forth in theory by Thebit.”[285]