624 APPENDIX

A

Although

the broad outline of

the

course

follows that of Einstein's lecture

notes

for

an introductory

course on

mechanics

at

the

University

of

Zurich,

given

in

winter

semester

1909/1910

(Vol. 3,

Doc.

1),

it is

clear that Einstein had made several revi-

sions. He

began

with

a more

systematic

and

comprehensive

introduction

to vector

algebra

and

then moved

quickly

on

to

a

discussion of

the

mechanics of

systems.

Mach's ideas

on

the

foundations of

mechanics,

which Einstein had alluded

to in

the

beginning

of the

course

three

years earlier,

are now

explicitly

discussed. The mathe-

matical methods of

Lagrange

and

Hamilton take

on

greater

prominence,

in

part

because Einstein needed them for the introduction

to

statistical mechanics which

he

presented

at

the conclusion of the notebook.

b. "Thermodynamik"

(2

hours)

Dällenbach's

notes

comprise

92

manuscript pages

of

one

notebook

(SzZE Bibliothek,

Hs.

304:1223).

Several

topics

that had

played

a

role

in

Einstein's earlier research

are

mentioned,

such

as

osmotic

pressure,

Brownian

motion, and

capillarity.

Einstein

apparently

laid

a

strong emphasis

on

applications,

in

particular

to

chemistry.

He

also

discussed

arguments

that touched

on

his

contemporary

research

interests;

examples

are

provided

by

the

third

law

of

thermodynamics,

on

which Einstein had

a

disagree-

ment

with Nernst

(see

Doc. 22),

and the

law

of

mass

action,

which

played

a

role

in

his

derivation of

the law

of

photochemical equivalence (see

Einstein 1912b

[Doc. 2]).

c.

"Physikalisches

Seminar"

(2

hours)

Dällenbach's

notes

on

the

physics

seminar Einstein

gave

in

winter

semester

1912/

1913

appear

to

fill the first 70

manuscript pages

of

a

notebook

(SzZE

Bibliothek,

Hs.

304:1222).

The remainder of

the

notebook contains material that

presumably

was

presented

in

the

physics

seminar

the

following semester (see

below).

Einstein discussed

a

broad

variety

of

subjects

in

his seminar,

paralleling topics

on

which he lectured in

other

courses

in this semester. He

began

with

a

discussion of

problems

from

mechanics,

which culminated

in

an

analysis

of

geodesic

motion that

may

have been relevant also

to

his

contemporary

work

on

gravitation.

He

then dis-

cussed various

problems

related

to

the

theory

of

gases and

liquids, and,

after

a

brief

exposition

of

thermodynamics,

returned

to

mechanics.

He

extensively

discussed the

equations

of motion

in

a

rotating

frame of

reference,

another

topic

with

a bearing on

his

contemporary

attempts

to

generalize

the

theory

of

relativity.

The

subsequent

sec-

tion of the

notes

deals

with

the

thermodynamics

of

radiation,

leading

to

a

derivation

of Wien's

displacement

law.

2.

Summer Semester

1913

a.

"Mechanik

der

Kontinua"

(3

hours)

Dällenbach's

notes

cover pp.

64-185

in his

second notebook

on

mechanics

(SzZE

Bibliothek, Hs. 304:1221).

The

notes

indicate that Einstein's

course on

the mechanics