410,.  411
Mecke  burner  for   flame  spectrum

wprk,  38s
Medium  with  parallel  faces,  passage

of  light  through,  7
Mercury,  arc  in  vacuo,  345

—  flame  spectrum  of,  384

—  green  line,  self-reversal  of,  528

—  lamp,  Arons,  395
Pfund's,  396

long  radiation  from,  284


678'


INDEX  OF  SUBJECTS


Mercury,    magnetic    resolution    of

fines,  538,  548,  SS3,  554,  SSS
• —  radiation  from,  505  '

—  series  in  spectrum,  589

—  structure  of  lines,  509

—  vapour,  absorption  spectrum  of,
465

under  reduced  pressure,  504

velocity  of  metallic  vapour  in

spark,  412
Metallic  salts,  absorption  spectta  of,

453

• spark  spectra  of,  400

Metals,  arc  spectra  of,  389

—  banded  spectra  of,  385  ,

—  plurality  of  spectra,  525

—  spark  spectra  of,  400

Methyl  acetate,  alcohol,  and  cyanide
for  absorption  spectrum  work,
467

—  benzoate,  absorption    spectrum

of, '479

—  group,  influence  On  absorption
spectra,  479

Micrometer  for  reading  spectrum
photographs,  151

—  eye-piece,  112,  152

—  screw,  36

Microscope,  travelling,  151
Minerals,  phosphorescent,  438,  443
Minimum  deviation  with  a  grating,

42,  204

with  a  prism,  56

Mirrors,  silvering  of,  650

Molybdenum,  asymmetric  resolu-
tion of  lines,  554

—  oxide  for  impregnating  carbon
poles,  459

Monatomic  gases  in  vacuum  tubes,

425,  430,  433
Monobromonaphthalene,   refractive

indices  of,  89
Motion   in  line  of  sight,  effect  on

wave-length,  411,  641


N

Nebulae,  Doppler  effect  in,  645
Nebulous  series  of  spectral  lines,

573.  574
Negative  glow,  spectrum  of,  521
Neodymium,  detection  of,  466
Neon,  spectrum,  150
magnetic  resolution  of  lines,

554
Nernst  lamp,  source  of  illumination

for  absorption  spectra,  460
Nickel,    in    spark   for    absorption

spectrum  work,  459

—  spectrum,  structure  of  lines,  509
Nigrosin,  for  sensitising  plates,  368
Nitrates,     absorption     spectra     of

metallic,  469
Nitrogen,   band    spectra    of,   613,
616

—  positive  band  spectrum,  Plate  III.
