890 SEC. 20. COLLECTION OF APPARATUS AND PHOTOGRAPHS 



6. Achromatic telescope by the celebrated Geo. Dollond, of London 



(1740). 



7. Telescope with distance-measurer, by Rochon (1828). 



8. Land surveying squares, simple, from the workshop of the Royal Obser- 



vatory of Padua. 



9. Heliotrope, by Ertel, of Monaco (1873). 



10. Camera Lucida, by the distinguished optician Amici, of Florence (1836). 



11. Reflection square from the Tecnomanasio of Milan (1868). 



12. Reflection square and allineator, by Goldschmid, of Zurich (1872). 



13. Seconds counter, by Ertel, of Monaco (1874). 



14. Telescope with distance-measurer, by Rochon (1869). 



15. Terrestrial telescope, by the optician Plossl, of Vienna (1845). 



16. Pantometer, with compass from the Tecnomanasio of Milan (1864). 



17. Ordinary telescope Cornet. 



18. Achromatic terrestrial telescope, by Frescura, of Padua, 1872. 



19. Hypsoineter from the Tecnomanasio of Milan. 



20. Pantometer from the Tecnomanasio of Milan. 



21. Studies of the human eye considered as a telescope, made by Professor 



Leguazzi in Padua (1873). 



GROUP II. GRAPHOMETERS, MULTIPLYING CIRCLES, AND THEODOLITES. 



1. Antique graphometer ; more than three centuries old ; instead of verniers, 



it is furnished with the diagonal scale designed by Don Pedro Nunnez, 

 and gilt with sequin-gold. The tripod is worthy of observation. 



2. English sextant (1798). 



3. Ebony sextant with ivory edge, by Shuttleworth, of London (1840). 



4. Repeating circle, by Lerebours, of Paris (1832). 



5. Reflecting circle, by Baumann, which gives five seconds with telescope 



(1845). 



6. Theodolite of the celebrated mechanician Reichenbach, of Monaco, which 



gives 10 seconds (1828). 



7. Repeating theodolite, by Carlo Starke, constructed in the Imperial and 



Royal Polytechnic Institute of Vienna ; the horizontal circle gives 4", 

 the vertical 10". The bubble has a sensibility of 4" (1852). 



8. Multiplying circle, by Reichenbach, of Monaco ; a remarkable machine ; 



the circle gives 4" (1832). 



9. Multiplying circle, by Gambey, of Paris, which gives 3" (1822). 



10. Repeating theodolite of Troughton and Sims, which gives 10": a well 



designed and well constructed machine. 



11. Eccentric theodolite, by Ertel, of Monaco, gives 10" ; an excellent and 



most convenient instrument, constructed with great care and elegance 

 (1843). 



12. Multiplying circle, by Lenoir, of Paris ; is an embryo instrument, but 



well designed (1836). 



13. Theodolite by Nairne and Blunt, of London; besides degrees, the hori- 



zontal circle furnishes the tangents of the various angles. With this 

 theodolite the engineer Valle executed the topographical survey of 

 the city of Padua (1828). 



GROUP III. PR^ITORIAN TABLETS. 



1. Steel band, length 20 meters, with divisions, constructed in the Tec- 



nomanasio of Milan (1870). 



2. Praetorian tablet on the Italian system, constructed by Giuseppe 



Stefani, of the Royal Observatory of Padua (1833). This is com- 

 pletely mounted to follow the configuration of the ground. 



