Figure 2 - uploaded by Brendan M. Laurs
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(Top) Galileo's original schematic diagram of his hydrostatic balance as it appears in his draft manuscript (Mss. Galil. Vol. 45, Car. 55v, Raccolta Palatina, Biblioteca Nazionale di Firenze) and (bottom) redrawn in the Edizione Nazionale of his collected works (Favaro, 1890, p. 217). Key: a-b = balance yoke; b = weight; c = suspension point; d = counterweight in air; e = counterpoise in water for pure gold; f = counterpoise in water for pure silver; g = counterpoise in water for a metal alloy or gem material.
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Context 1
... took a bit of practice and lots of patience, but I was able to make it work ( Figure 1). Since then, I have improved the technique and also managed to take photomicrographs through a darkfield loupe ( Figure 2). ...
Context 2
... the September 2013 Hong Kong gem show, Farooq Hashmi showed this author some more recent production of Ethiopian aquamarine that was quite different from material seen in the past: the crystals were prismatic, well formed, and of fine gem quality (e.g. Figure 2). He first encountered this aquamarine during the September 2012 Hong Kong show, when he obtained approximately 2 kg of the better crystals from a parcel weighing 20-25 kg; about 30% of that parcel showed good transparency. ...
Context 3
... mines in the area continue to occasionally produce good-quality rubies in marble (e.g. Figure 22). A new road was taken for the trip home, which went from Mogok to Pyin Oo Lwin via Mong Long. ...
Context 4
... 1586 Galileo Galilei (1564-1642; Figure 1), a 22-year-old drop-out from the University of Pisa, returned to Florence and wrote a short essay describing a hydrostatic method (Figure 2) for testing precious metal alloys. He developed the technique to improve upon the methodology articulated by Vitruvius (1567, IX.10-12), who described the ancient Greek scientist Archimedes' efforts to verify the composition of the gold in the crown of King Hiero (the Greek Sicilian king of Syracuse from 270 to 215 BC). ...
Context 5
... reflected light, both the crystal and the cut stone appear very dark violet-purple or purple in daylight, and reddish purple or red-purple in incandescent light (Figure 1). Fibre-optic illumination shows them to be intensely coloured and transparent (Figure 2). The colour and colour variation between daylight and incandescent light resemble some dark purple or purplish red garnets of the pyrope-almandine series, or some purplish rubies. ...
Context 6
... this study, the authors obtained eight samples (some of which consisted of multiple pieces) from various Chinese collectors. These included hand-carved art pieces, beaded bracelets, loose beads, hornbill raw material and a sawn fragment (see Table I and Figure 2). The authors also visited international exhibitions and marketplaces to make visual observations of several samples that consisted mostly of beaded bracelets and carved pieces of varying weight and form. ...
Context 7
... present author, who is a medical doctor, became interested in whether the CT instrumentation used in human clinical practice (e.g. Figure 2) could be applied to detecting rubies in marble host rock during the course of her gemmology diploma studies. The article reports on the process and results of imaging this sample. ...
Context 8
... oriental pearls will show very little or nothing at all, although a conchiolin-rich centre is sometimes seen and indicates a natural pearl. Some of the structures seen in natural pearl are Figure 2, which is a radiograph of some pearls showing much structure, an effect which is not often seen. ...
Context 9
... Hammid (Tino Hammid Photography Inc., Los Angeles, California, USA) discussed gem photography while showing examples of spectacular images (e.g. Figure 2) to illustrate several points: (1) lighting defines an object, and the use of selective and subtle reflections helps to convey its shape; (2) shadows provide a sense of place, and reflections of the object below the stone add reality to the image; and (3) colour accuracy is critical, and using a ColorChecker card and a monitor calibrator are highly recommended. ...
