90 



Messrs. Ayrton, Mather, and Sumpner 



Type. 



Thomson. 

 One pair 

 of coils. 



Thomson. 



Two pairs 



of coils. 



( 

 Mudford's I 

 Thomson. J 



One pair 



of coils. 



Mudford's | 



Thomson. J 



Two pairs j 



of coils. . ! 



( 



Rayleigh, j 



Gray, or ■{ 



Rosenthal. I 



d'Arsonval. \ 



( 



Flat Coil | 



or I 



Multiplier j 

 type. 



Description. 



Elliott's Tripod (F.T.C.) \ 



Tripod „ I 



Elliott's Tripod. Specially light f 

 needles t | 



Elliott's Glass Cylinder (F.T.C.) J 



Latimer Clark &Muirhead (F.T.C.) + ... 



Elliott's Stock pattern t 



„ Large Coil pattern t 



)! >) » 



„ Special formt 



„ Ayr ton & Perry ballistic (Japan) 

 Langley's Bolometer 



Figure 5 (O.I.) 



f 



Eell Magnet Ballistict 



Figured (0.1.)' '.'. '.'.ZZ.... 



Figure 6 (F.T.C.) 1 



» (OX) 



Variable damping Large Coils (C.I.) 



Figure 7 (C.I.) 



t 



Figure 8, Non-astatic (C.I.) 



Figure 9, Astatic (C.I.) 



Non-reflecting (C.I.) 



Gray's (Proc. Roy. Soc. 1884, p. 287) ... 



Figures 11 & 12 (C.I.) 



Threlfall's (Phil. Mag. Dec. 1889, p. 460) 



John's High-resistance (C.I.) 



Carpentier's ordinary 



John's Low resistance (C.I.) 



Invariable sensibility, Large type (C.I.)... 

 Nalder's type fitted j Pole ieces ]n , Q j , 



with Invariable- > r out 



sensibility device. J 

 Carpentier miUiamperemeter (C.I.) 



Single Needle Post-office pattern (C.I.)... 



Coils 6 centim. long outside 

 2-7 „ broad „ 

 2-2 „ high 



Winding 0*6 „ thick. 



Detector nearly astatic "1 .. . 

 ,, partially astatic t. 



1. 



2. 



3. 



r. 



M. 



D. 



06 



3-8 



76 



50 



102 



204 



3860 



7550 



15,400 



6000 



15,750 



32,000 



4600 



1220 



2440 



20,000 



8700 



10,700 



7000 



4300 



7110 



12,300 



7680 



15,200 



30,000 



10710 



21,800 



30,000 



20,000 



40,000 



20,000 



1070 



1430 



20 



125 



250 



26 



347 



349 



2,457 



1375 



2160 



6,410 



2720 



3360 



2086 



880 



1720 



7800 



720 



1350 



10,000 



640 



1200 



5330 





2280 



700 



1720 



2970 



686 



1660 



1600 



9744 



4200 



4280 



360,000 



50,000 



54,200 



350,000 



15,700 



31,400 



44 



22-9 



25-4 



44 



25 



27-7 



5-2 





9-06 



30,000 



32 



64 



4090 



54 



63 



15680 



290 



3-74 



750 



137 



260 



208 



286 



375 



3-8 



39 



42 



21 



190 



181 



274 





169 



274 





242 



183 





73 



800 





190 



400 





303 



350 





146 



64 





125 



4-3 





14-8 



4-3 





35-2 



•87 





6-8 



•87 





16-7 



2000 





490 



2000 





42 



4. 



4-76* 



128* 



9,700* 



20,000* 



1520* 

 6720* 

 4450* 

 9550* 

 13,700* 

 25,000* 

 900 

 156* 



220* 

 1360* 

 2110* 

 1080* 

 850* 

 755* 

 1440* 



1860* 



1010* 



2640 



34,000* 



19,700* 



16 

 174 

 5-7* 

 40* 

 39 2 

 235 



163* 

 236* 

 26-4* 

 114* 



106* 

 152* 



45-7* 



119* 



190* 

 91-7* 

 78-7* 

 9-3* 

 22-1* 

 4-27* 

 10-5* 

 308* 

 26-4* 



