LIST OF PLATES. 



I'l.^ri: I, FigH. l-o. — Hoiizunial I'lMuliiliiiii Seisinofjrajili, (niiciiial tnrin. 



Plate II, Fijrs. 4-(!. — Ilmi/i mal I'l'iiilulmn Scit^nioprai'li. iin]>riivt<l furiii. 



I'r.ATE III, Figs. 7 anil S. — I)itails ot llDiizontal Pendulum ScisindL'iaiili. 



Plate IV, Figs. 9 and 10. — Hnrizontal Pendulum Seismoirrapli willi riui: bdli. 



Plate V, Figs, lo-is. — Hoi-i/ontal Pendulum without joints. 



Plate VI, Figs. 19 and 20. — Horizontal Pendulum with twn drirri'os of freed. iiu 

 (Gray). 



Platk VII, Fig.-. 11, 12, 21, 2'2, 23an<l 33. — Cmieal Pendulum; K(,llin- Sphere; 



Kolling Segment; Kolling Cylinder; Vertical Seismometer (Gray J. 

 Plate VIII, Figs. 24-2S. — I.,ong Pendulum Seismograpli. 

 Plate IX, Figs. 29 and 30. — Duplex Peiululuni Seismograph. 

 Plate X, Figs. 31 and 32. — Astatic Pendulum Seismngra])!). 

 Pr.ATE XI, Figs. 34-37. — Vcriical-Motion A.«tatie Seismograph. 



I'l.ATE XII. — Record of Earili.'iuako of Feb. 7th, 1881, given hy the llori/.cintai 

 Pendulum Scismograjih. 



Plai.E XIII.— Record r)f Earthquake of March «ih, 1881, do. do. 



i'LAFE XIV.— Record of p:arih.puiko .,f March 1st, 1882, do 



Pl.\te XV.— Record of Karthciuakes of March lllh 1882, «lo 



Plate XVI.— Record of Eartliquake of March l:iih, 1882, do, do. 



Plate XVII.— Recu-d of Earihipiake of Aug. 18th, 1882, do. dn. 



Plate XVIII.— Record of Earthquake .,f Sept. 29ih, 1882, i\n. .1,,. 



Plate XIX.— Itecord of Earlhqujike of April 23rd, 1883, do. <!,,. 



Also Static Record of the same Ivirlliquake given hv the Duplex Peiiduhini 



Sei.smograph. 



Plate XX. — Record of the .same Earthquake given hy the Long PeMduhno 

 S<-isiii(ij;raph. 



Pi VTE XXI, Fig-^. 38-4'). — ( 'ircuii-clo.-^er taftei- Palmieri); Diagram of Counec- 

 lion.s; S-nsilive Circuit-closer (Milne^; Sensitive Circuit-closer (Rossi); 

 'rime-taker (Milne) ; Driving gear for Record Receivers. 



Plate XXH. — Experimental Test-of ihe llori/onlal IVnduIum Seismograph. 



I'l.Ari; XXIII, I'igs. 4ß-53. — Method- uf .\stnlic Su.xpcnsion by Linkwork. 



do. 

 do. 



