ILLUSTRATING ITALIAN SCIENCE. 901 



of January 1610, and first saw the spots on the sun. Having 

 been broken, it was presented by Viviani to Prince Leopoldo dei 

 Medici, who placed it in a frame finely wrought in ivory, with 

 inscriptions. 



Compass of Proportion, called also military compass. 

 invented by Galileo in 1596. 



Natural Magnet, mounted by Galileo, weighing six 

 ounces. He presented it to the Grand Duke Ferdinand II. dei 

 Medici. It holds a weight of ten pounds. It is made in the shape 

 of an urn. 



Air Thermometer, in the form first given by Galileo. 



Galileo's Microscope, then called Occhialino. Only the 

 little tube remains, the lenses are wanting. 



Exact copy of the Drawing representing the first idea of the 

 Application of the Pendulum to the clock ; dictated by 



Galileo, then blind, to his son Vincenzo and his disciple Viviani. 

 Elucidated on the original of the Galilean manuscripts in the 

 Biblioteca Palatina. 



INSTRUMENTS OF THE ACCADEMIA DEL CIMENTO. 



Thermometer, cinquahtigrade, with spherical bulb. The 

 freezing point corresponds to 13 '5. The academicians used this 

 thermometer for the meteorological observations instituted first 

 by them in 1654. 



Thermometer, cinquantigrade, with cylindric bulb. The 

 point of ice melting corresponds to 13*5. 



Thermometer, settantigrade. The freezing point is at 23 -5. 



Thermometer for bath. When immersed in the bath it must 

 indicate 49, as is written in the upper little ball. 



Thermometer, with foot simple divided in 470, corresponding 

 to 26 centig. It served for the experiment made to ascertain 

 whether the cold of ice reflects itself from the mirror like the 

 heat of burning coals and light. 



Thermometer, with elaborate foot. An object of art. 



Thermometer in winding form, very sensitive, height 32 cm. ; 

 the spiral tube is 2 30 meters long. 



Thermometer, with balls (thermoscope). The alcohol dilating 

 by heat, the little balls fall one after another according to their 

 weight. 



