372
DOC.
36
TRANSVERSE
AND
LONGITUDINAL
MASS
Published in Annalen
der
Physik
21 (1906):
583-586.
Dated
Bern,
August
1906,
received 4
August
1906,
published
20 November 1906.
[1]
For the
concepts
of electrostatic and
mag-
netic
power
of
deflection,
see
Einstein 1905r
(Doc. 23), p.
920,
and Einstein
1907j
(Doc. 47),
p.
437.
[2]
See
Kaufmann
1906a,
which also cites
Kaufmann's
earlier
papers.
[3]
For
Einstein's
original
definitions
of
the
transverse and
longitudinal mass
of
an electron,
see
Einstein 1905r
(Doc. 23),
p.
919. For his
definition
of
the
longitudinal
mass
in this
paper,
see p.
585.
[4]
This formula
is
easily
derived from the def-
inition
of
ul
given
below.
[5] a
is small because the electrons
move
in
circular
trajectories
close
to
R2.
[6]
See Einstein 1907b
(Doc. 39),
in
particular
p.
571,
for
a
discussion
of
these fluctuations.
[7]
See
Bucherer
1904,
p.
58.
[8]
See Abraham 1902a,
1902b,
1903.
[9]
See Lorentz
1904a,
Einstein
1905r
(Doc.
23).
Einstein
apparently was
the first
person
to
use
the
phrase,
"Theorie
von
Lorentz und Ein-
stein," which
soon was adopted by
others
(see,
e.g.,
Planck
1906b,
p.
424). Kaufmann
had
ear-
lier
referred
to
the
"Lorentz-Einsteinschen
Grundannahme"
(Kaufmann 1906a,
p.
495),
but
was
careful to
distinguish
between the two
theories
(see
ibid.,
pp.
491-493).
[10]
In
1907 Einstein noted that
sufficiently
fast cathode
rays
for such tests
were
still not
available. See Einstein
1907j
(Doc. 47),
p.
437.
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