SCIENTIFIC EXPERIMENTAL APPARATUS. 



445 



with an electro-magnetic clironograph. Made by Fulcher, Cambridge, 

 England. 



6. Kymographion. — Modification of tbe above. Made by Warden, 

 Mnirsbead & Black, London. 



7. '''■ SignaV of Deprez. Electro-magnetic chronograph, recording up 

 to 250 double vibrations per second. 



8. Chronograph of Masey. Similar to above, recording to one-hun- 

 dredth of a second. 



9. Spectroscope^ one prism, by Browning, London. 



10. WilcVs Polar istrohometer. — Schmidt «& Haensch, Berlin. 



11. Completely fitted microscope^ by Zeiss, Jena. With microspectro- 

 scope and polarizing apparatus. 



12. Seconds clod' with electric attachment. Elliott, London. 



Condensed List of Apparatus in Smithsonian Institution. 



1 Shaw's testing machine. 

 1 Gaiffe's induction coil and bat- 

 tery. 

 1 Varley's resistance coil. 

 6 Euhmkorff's galvanometers. 



1 electrometer. 



2 Holtz electrical machines. 



3 Soleil's polariscopes. 

 1 Hall's spectroscope. 

 1 heliostat. 



1 telescoiDc, with rock salt objective. 



14 radiometers. 

 1 lihonautograph. 



1 Koenig's chronograph. 



2 electrical intemii^ters. 



1 set Koenig's acoustical apparatus. 

 1 Hough's barograph. 



1 Green's siphon barometer. 



2 Casella's sensitive hygrometers. 

 1 magnesium lamj). 

 Miscellaneous optical,electrical, and 



meteorological apparatus. 



