DOC.

1

MECHANICS LECTURE NOTES 125

2)

Falls

m

als Konstante

gesetzt

wird,

dass

die

Grösse der Beschleuni-

gung

(d2xdt2)2

+

(d2ydt2)2

+

(d2zdt2)2

proportional

ist

der

Grosse

der

Kraft

Jx2

+

Y2

+ Z2

Wenn

nun

die

wirkende Kraft

nicht

die

unserer

Messfeder sondern

irgend

eine

andere Kraft

ist,

so

wird sie durch

diejenige

der

Messfeder

ersetzt,

welche

dieselbe

Bewegung

erzeugt.

Dann

gilt

das bisher

Gesagte

für

beliebige

Kräfte.

AD.

[3

004, 3 005].

This document

is

preserved in two notebooks,

17.5 x

21.5

cm,

of white

squared paper,

and

is

mostly

written

in ink,

with

some

portions

in

pencil.

Pagination

in

square

brackets

refers to

pages

in the notebook and is

displayed

in

the outside

margins

of

the

tran-

scription.

Pages

that

are

omitted,

such

as

blank

pages

or pages

containing

unrelated

material,

are

not

numbered.

The

first

notebook contains the material

presented

as

[pp. 1-94]

of

the

notebook.

On

the

flyleaf

the

following

notes

are

made

in

pencil:

"Über die Rolle der Atomtheorie

in

der

neueren

Physik" (the

title of Einstein's

inaugural

lecture

at

the

University

of

Zurich, given

on

11

Decem-

ber

1909),

"Dienstag,"

"Mittwoch,"

"Montag

10-12," "Samstag

10-12,"

and

"Mittw

5-7

Ther-

modyn" (in

addition

to mechanics,

Einstein also

taught thermodynamics in

the winter

semester

1909/10;

see Appendix B,

"Einstein's Academic

Courses").

The notebook also contains three loose

sheets.

One bears the

heading,

"Some

empirical facts

of fundamental

importance

for the

theory

of

light

propagation.

(Addendum to

§7)" ("Einige

Erfahrungsthatsachen,

welche

für die Theorie

der

Lichtausbreitung

von

fundamentaler

Bedeu-

tung

sind.

(Ergänzung

zu §7)");

this

heading is

apparently

related

to

Doc.

1

in Vol.

4 but

is

followed

by

calculations

that

possibly refer to

the

propagation

of

light

quanta.

The

verso

of

this

sheet

presents

calculations that

seem

to

be concerned with kinetic

theory

and that

are perhaps

related

to

material

in

the second

notebook;

similar calculations

are

found

on

a

second

sheet.

This sheet also contains

references to

"Massen

von

Eddington," "Geschwindigkeiten,"

and

"Grösse

der Sternhaufen."

The third sheet has

thermodynamic

calculations

on

the

top

half

and

a

calculation related

to

the

problem

of the

catenary on

the bottom

half.

This material

is

omitted.

The notebook concludes with

two pages

written

upside

down and

beginning

from the

back,

containing

an

alternative derivation

of

the fundamental

equations

for

a

material

point.

These

pages

are

printed

as

[pp. 116-117]

of

the

notebook.

The

lecture notes

continue

in

the second notebook.

Following

the material

presented

here

as

[pp. 95-115],

this notebook contains the

following

additional

material,

which

is

omitted:

numerical

computation

and

graphical integration

of

two

functions and

a

calculation

on

kinetic

gas theory (all perhaps

related

to

material

on

the

two

loose sheets

in

the first

notebook),

calculations

on

general relativity

and

a

graphical representation

of

a

function

(on

both

sides

of

a

loose

sheet),

and, starting

from

the

back and

upside

down from the other

material,

seven

pages

of notes

in

Mileva Einstein-Maric's

handwriting, containing

material

very closely cor-

responding to

the

introductory

sections of

the first notebook,

followed

by

an

eighth page

with

a

drawing

of three

intersecting

circles,

also

in

Einstein-Maric's hand. The remainder of the

notebook consists of blank

pages

and

the

remnants of

one

torn-out

page.

[1]Dated

on

the

assumption

that

Einstein

prepared

these

notes

for

his

course

in

the winter

semester

1909/10

at

the

University

of

Zurich, 18

October

1909 to

5

March

1910; see

Zürich

Verzeichnis

1909b,

title

page.