802 DOCUMENT 564 JUNE 1918

Von

dem

was

sonst in der Welt

geschieht

habe ich

genug

bis

zum

Halszäpfchen.

Und noch ist kein

Ende abzusehn.

Herzl Grüsse

von

Ihrem dankbaren Schüler

Walter Dällenbach.

Herr

Besso wird Ihnen nächstens schreiben und lässt inzwischen herzlich

grüs-

sen.

ALS.

[9

074].

[1]The

dissertation (Dällenbach

1918),

which Dällenbach had

begun working on

at the ETH in

autumn

1916 under the

supervision

of

Hermann

Weyl

(see

Doc.

270,

note

6),

was

republished

as

Däl-

lenbach 1919a.

[2]The

integration

extends

over

the volume traversed

by a

molecule

during a physically

short time

interval. The

equation expresses

the condition that molecules

stay

neutral

during

their motion.

[3]See Lorentz

1904b.

[4]The

summations extend

over

all

charges

ek

within

a

molecule; N is the number

of

molecules in

a

unit

volume;

here and in the

following

the

square

brackets denote the

vector

product.

[5]At

this

point

in the

original

text,

Dällenbach draws

an arrow pointing

toward the

previous equa-

tion.

[6]At

this

point

in the

original text,

Dällenbach

draws

an arrow pointing

toward the last boxed

element

above.

[7]See

Cohn 1900.

[8]At

this

point

in the

original

text,

Dällenbach

draws two

arrows pointing

toward the second and

third

terms,

respectively, on

the

right-hand

side

of

the

previous equation.

[9]At

this

point

in the

original

text,

the

author

draws

an arrow pointing

toward the second

dipole.

[10]As was

first

pointed

out

in Laue

1911a,

p.

530,

the

symmetry

of

the

energy-momentum

tensor

expresses

the law of the inertia

of

energy,

which in this context refers

to

the

equivalence

of

momentum

and

energy

flux divided

by

c2,

an

equivalence

first stated in Planck 1908.

[11]At

this

point

in the

original

text,

Dällenbach draws

an arrow pointing

toward the

integrand

of

the

previous

equation.

[12]Jakob

Laub. The criticism

of

Einstein

and

Laub 1908b

(Vol. 2,

Doc.

52),

quoted by

Dällenbach

in the

next

paragraphs,

is

omitted in the Annalen version

of

his dissertation (Dällenbach

1919a).

[13]Hermann Minkowski;

see

Minkowski 1908.

[14]In

his

paper,

Dällenbach

points

out

that

only microscopic

laws have

a

strict

validity, suggesting

that the

asymmetry may

be

a

result

of

the

averaging process.

[15]Submitted

to

the ETH

a

month later

(see

Doc.

598).

[16]Michele

Besso had

earlier

pursued common

research interests with Dällenbach and

Weyl

(see

Doc.

283).

[17]Einstein’s

and Smoluchowski’s

papers on

Brownian motion

are

Einstein

1905k, 1906b, 1907c,

and 1908c

(Vol.

2, Docs.

16,

32,

40, and

50),

and Smoluchowski 1906 and 1916. Einstein’s

paper

on

critical

opalescence,

Einstein 1910d

(Vol.

3,

Doc.

9),

was

also included in the

reading

(see

Doc.

591).

[18]See

Doc.

472, note 3,

for

a

characterization

of

Weyl's theory.

For Einstein’s

objection, see

Ein-

stein 1918h

(Vol. 7,

Doc.

8),

a

critical

note

appended

to

Weyl

1918b. The text

of

Einstein’s

note

can

be found in Doc. 512.

[19]See

Einstein 1918h

(Vol.

7,

Doc.

8).

[20]At

this

point

in the

original

text,

the author draws

two

arrows, pointing

toward "Körper" and

"Uhr,"

respectively.

[21]See

Einstein 1918h

(Vol.

7,

Doc.

8).

[22]The simplest

candidate for the

Lagrangian

in

Weyl’s theory

(see Doc.

499,

note

4)

gives

fourth-

order field

equations.

The result

to

which Dällenbach refers is mentioned

(without

proof)

in

Weyl

1918d,

p.

411.