202 DOC. 10 RESEARCH

NOTES

AD.

[3

006].

These

notes

are

written

in

a

blue bound

notebook,

17.5x21.5

cm, consisting

of

squared

white

paper.

Two

pieces

of

paper

were

probably taped

later

to

the

front of

the

note-

book

by

Einstein's

secretary,

Helen Dukas.

On the back

cover

of

the notebook,

"Relativität"

is

written

in

Einstein's

hand,

probably

an

indication that

he

began

his

notes at

that end. The

first and

last

pages

are

glued to

the

inside of their

respective

covers.

A

margin

of about

1

cm

is

usually

maintained. Entries

are

mostly

in ink. The

book consists of

two parts beginning

from

the

back

and

from

the front,

respectively.

The

material

presented

here

as [pp.

1-9]

be-

longs to

the

part beginning at

the end;

[pp.

10-58]

belong to

the

other

part.

The material

on

[p. 9]

and

[p. 58]

is

on

the

same

page

in the notebook,

upside

down relative

to

one

another. It

is

on

this

page

that

the

two parts

of the notebook

meet.

Before

[p.

58]

three blank

pages

ap-

pear.

Following

[p.

57]

a

page

has

been

torn out

with

a

9

mm

tab

remaining.

A

total of

25

pages

of unrelated material

has been

omitted

and

can

be

characterized

as

falling

into three

parts,

Parts

A, B,

and

C.

The

page designations

that follow for the omitted

parts

can

be

found

on

the copy

of this document

in the

Einstein

Archive,

where

"3 6" is the

archival

designation,

while "32L" indicates

the

left-hand side of

p.

32 and

"38R" indicates

the

right-hand

side of

p.

38.

Part

A

was

written

beginning

from

the

back of

the

notebook

and

consists of

pp. 3

6

32L-3

6 38R

on

the copy; it precedes

[pp.

1-9].

Part

B

comprises the

pag-

es

beginning

from

the

front of

the

notebook,

pp.

3

6

01L-3

6 05L;

these

pages precede

[pp.

10-58].

Part

C

consists of

pp.

3

6

29R-3

6

31L;

three blank

pages separate

this

part

from

p. 3

6

43L

([p.

9]/[p.

58]).

Part

A

documents Einstein's

attempt

at

a

tensorial derivation of

the

ponderomotive

force

density.

Pp. 3

6

36L-3

6

37L

deal with

the

role of electric

polarization in

relativistic electro-

dynamics.

Pp.

3

6

37R-3

6 38R

contain calculations related

to

various

topics, among

them

"Momentum

According to

the Theory

of Radiation"

("Impuls

aus

Strahlungstheorie,"

p.

3

6 37R) and

statistical considerations

on

absorbed

and

emitted

energy

(pp. 3

6 38L and

3

6 38R).

Part

B comprises

various calculations

related

to

the

quantum hypothesis, to

statistical

physics,

and

to

thermodynamics.

On

p. 3

6

02L Einstein derives

equation (195)

of Planck

1906b

by

methods

similar

to

those of Einstein and

Hopf 1910a,

1910b

(Vol.

3,

Docs.

7

and

8).

These methods also

play

a

role

on pp.

3

6

02R-3

6 03R and

pp.

3 6

04R-3

6 05L,

whereas

p.

3

6

04L

is

related

to thermodynamics.

Part

C

contains

notes

on

thermodynamics possibly

related

to

Einstein's

course

on

this

subject at

the

German

University

of

Prague

in

winter

semester

1912/1913.

[1]These

notes are

dated

on

the

assumption

that

they

were

written

no

earlier than

August

1912,

when Einstein

first

adopted

the

metric

tensor

as

the

fundamental

quantity

of his

theory.

[2]Einstein

confirms that

G^

defined

by

the

invariant differential

form

for

ds2

transforms

as a

tensor.

The matrix

display

for

the

coefficients

apn,

is

virtually

identical

to

that of Laue

1911a,

p.

57.

The

same

representation

is

employed

in

Einstein's

manuscript

on

special

rela-

tivity (Doc.

1).

[3]This

special

case

corresponds to

the

static

gravitational

field

as

treated

in Einstein

1912c,

1912d

(Docs.

3

and 4),

provided

c

is

a

function of

x1,

x2,

x3.

[4][Eq.

1]

is the field

term

of

the

gravitational

field

equations

as

given

in

Einstein 1912d

(Doc. 4),

p.

456.

It is

converted

to

[eq.

2]

in

terms

of

y

=

c2/2

=

G44/2.