the Platinum Metals in Different Gases. 391 







TABLE. 
Temperature. || Pressure. Time, Loss in 
R / | Gas. | ; 30 Min. 
| (Black). (Celsius). | ee Hg. — meg. 
Platinum 1500° | 16709 |) Air |. 760 | 30 0-68 
Width 1:0 mm. a z ! 3 he ee eee ne 0°32 
Thickness 0°1 mm. x fe / OY aoe / : S41 
) eS . Ney 53 - 0-05 
a ' bf EE yal Besa pee Mee 0:03 
9 ! a8 | 99 | 0-2 39 0:00 
1150 | 1260 Air | 760 | 30 0-03 
1050) & L150 +I = - | , 0-01 
rh) . | re) O 9 | ’ 0:04 
| 
Rhodium. 1500 | 1670 Air | 760 | 30 0.29 
Width 0-8 mm. ‘ is | z aan , 0-14 
Thickness 0°3 mm. | x | ss O 760 | ss 1:60 
TSC ae | F | 0:05 
Iridium. 1500 | 1670 Air | 760 | 15 12-57 
Width 0°7 mm. : i / = 29 25 30 1-61 
Thickness 0°35 mm. | ic 5 O 760 10 184°5 
) ‘ | * N can | ee 0-46 
Tridium. Sie ) 4 
.. ' 1500 | 1670 H | OS: {Peake ‘O4 
Width 0:8 mm. EC eee ah ocak Ap) de ) as 
ee nim. | 1150 | 1260 Air | 760 | 10 0-78 
90 Pt,10Ir. | 1500 | 1670 | Air | 760 30 1-47 
Width 0-5 mm. ADD Re Va ane a 3°72 
Thickness 0°2 mm. | e | hs N s : 0-16 
Palladium. 1350 1500 Air OOF ti AO 1:00 
Width 10 mm. - . a _ BO te RO 729 
Thickness 0-1 mm. | __,, if O foo? | +a 0-74 
oy ” { N ” 3 1°12 
| 1300 =. 1440 Air 2p cin) AO 1-09 
SX ‘ H 50, ip 1-06 
cf . 3% ~ O22) AD 10°85 
; 1250 | 1580 || Air 760 | 30 0:06 
| 1150 1260 | is es Ha bes 0-01 
| 
The observations on each metal were made in the following 
order :— 
1. At atmospheric pressure, the tube being left open at 
top and bottom to allow a free circulation of air. 
2. With the tube pumped out to a water vacuum. 
3. With a slow stream of commercial oxygen or nitrogen 
passing slowly through the tube. 
4. With the tube filled with hydrogen at different 
pressures. 

