BIOGRAPHIES
379
1904-1908,
technical
expert
at Swiss
Patent
Office,
hired
on
Einstein's
recom-
mendation.
1908-1909,
winter
semester,
audited Einstein's
course on
theory
of radiation at
University
of
Bern.
1909-1910,
worked
as consulting
engineer
and
pursued self-study
in
Bern. 1910-1915,
worked for textile and insurance
firms in
Gorizia, Italy.
1915,
returned
to
Switzerland.
1916-1918, lived in
Zurich;
acted
as
intermediary
between Einstein and Maric
during
their
separation; helped
care
for their
sons
during
Maric's
illness.
1916, appointed
Privatdozent in
patent
law
at
ETH.
1918-1919,
catalogued
his
uncle's
library
in
Rome.
1920-1938,
worked
at
Swiss
Patent
Office in
Bern and
taught
patent
law
once a
week at
ETH
in
Zurich.
1926,
Einstein intervened
on
his behalf
when
an attempt was
made
to
dismiss him from Patent
Office.
1930,
met
with
Einstein
for
the last
time.
1939-1944,
lived in
Geneva after
retiring.
1944-1945,
lived
with
son
in Petit-Saconnex after
wife's death;
lectured
to
war refugees
in
work
camps.
Einstein thanked him for "manche wertvolle
Anregung"
in
his 1905
paper on special
relativity;
Einstein characterized him
as a
perpetual
student.
Sources:
Einstein/Besso
1972
and Einstein
correspondence
with Maric.
Ehrat,
Jakob
b.
27
January
1876 in
Schaffhausen
d. 18
March
1960 in Uerikon, canton
of Zurich
ETH
classmate, friend,
and
correspondent
of Einstein. Son of
a
baker.
At-
tended
Gymnasium
in
Schaffhausen.
1896-1897,
first
semester,
studied
at
University
of
Zurich;
second
semester,
studied
at ETH,
faculty
of
engineer-
ing.
1897-1900,
studied mathematics
at ETH,
Section
VI
A,
where
he met
Einstein.
1900-1903,
Assistent to
ETH
mathematics
professors
F.
Rudio, A.
Hurwitz,
and
J. J.
Rebstein.
1904-1908,
instructor
at
boarding
school
in
Bieberstein/Rhön,
Bavaria.
1906, University
of Zurich doctoral dissertation.
"Uber das
Algebraischwerden
der
Integrale
irrationaler Differentiale
...,"
supervised
by
C. F.
Geiser.
1908-1911,
Assistent
to
Marcel
Grossmann
at
ETH; teaching
aide
at
Kantonsschule,
Zurich.
1910-1945,
teacher of mathe-
matics and
accounting
at
Gymnasium,
Winterthur.
1914,
married
Margrit
Schmid,
with whom
he
had
two
children.
1926,
underwent
operation
for
detached retina.
1945-1960,
lived in Richterswil and Uerikon after
retiring.
Sources:
Hans Ulrich
Wipf,
"Jakob Ehrat
und Albert Einstein.
Skizze
einer
Freundschaft,"
Schaffhauser Mappe
(1973),
pp. 29-30;
curricu-
lum
vitae, SzZSa,
records of
Kantonsschule, Zurich;
correspondence
with Einstein.
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