34 



to the Havannah, after our return from the 

 Oroonoko : neither the apparatus nor the achro- 

 matic telescopes, nor the timekeeper by Arnold, 

 which I had sent for to London, reached Ame- 

 rica. The following is the list of the instru- 

 ments I had collected for my journey from the 

 year 1797, and which, excepting a small num- 

 ber easy to replace, served me till 1804. 



LIST OF THE PHYSICAL AND ASTRONOMICAL IN- 

 STRUMENTS. 



A timekeeper by Lewis Berthoud, No. 27. This 

 timekeeper had belonged to the celebrated 

 Borda. I have published the detail of it's 

 rate of going, in the introduction to my col- 

 lection of astronomical observations ; 



A demi-chronometer by Seyjfert, serving for as- 

 certaining the longitude at short distances ; 



A three-foot achromatic telescope by Dollond, in- 

 tended for the observation of Jupiter's satel- 

 lites ; 



A telescope by CarocM, of less dimensions, with 

 an apparatus to fix the instrument to the 

 trunk of a tree, in forests ; 



A lunette d'epreuve, with a micrometer engraved 

 on glass, by Mr. Rohler, astronomer at Dres- 

 den. This apparatus, placed on the plane of 

 the artificial horizon, serves to level bases, to 

 measure the progress of an eclipse of the sun 

 or the moon, and determine the value of very 



