iv
,
‘
PREFAC‘E
_
‘
nize the concepts involved as necessary abstractions of his own
experience. The apparatus
has been simplied from the original
‘
research form to an extent which avoids the expenditure of too
much time or effort, yet permits a degree of accuracy which leaves
conviction. — Anyone with a tastefor experimentation will be
fascinated by watching the changes of velocity of an oil drop in a
condenser, as it picks up or loses charges, or by observing the
scintillations produced on a screen by particles thrown out of an
'
atom during its tran$mutation.
Among the simpler experimentsdescribed may be mentioned
those numberçd 1—1,4—1,4—2, 5—1, 6—1, 6—2, 8—5, 11—1 and 12—4,
_
while the folloWing should be attempted only by the more advanced
'
students: 3—1, 4—4, 8—4,9—3 and 10—1.
Experiments 14—1 and
1_5—1- require considerable previous training and should serve as a
.
challenge to the best of students. Many of the experiments, in
.
their modied form, are published here for the rst time.
_Many details of laboratory technique have been woven into
the experiments. In addition, the last four chapters of the book
are entirely devoted to the techniques which are applicable in
…;commori to several elds of modern physics. Parts of this mate—
'
*
rial have not been published before.
-
'
_
The problems at the end have been found to be of great assist—
1’
anse to the student in grasping the subject matter.
The author wishes to express his thanks to Professor A. ].
'l
_ “ Dempster, who has continued to give invaluable advice, suggesting
Ïj improvements and new experiments; to Professor A. H. Compton
his valuable criticism of the Chapters on xlrays and cosmic
Dr. L. W.AlVarez who has read much of the manuscript; …
to the various members of. the faculty at Ryerson Laboratory for
’
oççasional advice; and especially to the groups of students who
have…
and rearranged the experiments during the
‘
:
.
.
-
‘
'
-'
…
_
.
a
?
v
.
.
]. BARTÔN HOAG.î
:ÇL; RYERSQN?HŸSRÀL LABORATORY:
‘
’
-
'
:
—
'
*
‘
,
'
'
5 Ï
’
…
,
‘
PREFAC‘E
_
‘
nize the concepts involved as necessary abstractions of his own
experience. The apparatus
has been simplied from the original
‘
research form to an extent which avoids the expenditure of too
much time or effort, yet permits a degree of accuracy which leaves
conviction. — Anyone with a tastefor experimentation will be
fascinated by watching the changes of velocity of an oil drop in a
condenser, as it picks up or loses charges, or by observing the
scintillations produced on a screen by particles thrown out of an
'
atom during its tran$mutation.
Among the simpler experimentsdescribed may be mentioned
those numberçd 1—1,4—1,4—2, 5—1, 6—1, 6—2, 8—5, 11—1 and 12—4,
_
while the folloWing should be attempted only by the more advanced
'
students: 3—1, 4—4, 8—4,9—3 and 10—1.
Experiments 14—1 and
1_5—1- require considerable previous training and should serve as a
.
challenge to the best of students. Many of the experiments, in
.
their modied form, are published here for the rst time.
_Many details of laboratory technique have been woven into
the experiments. In addition, the last four chapters of the book
are entirely devoted to the techniques which are applicable in
…;commori to several elds of modern physics. Parts of this mate—
'
*
rial have not been published before.
-
'
_
The problems at the end have been found to be of great assist—
1’
anse to the student in grasping the subject matter.
The author wishes to express his thanks to Professor A. ].
'l
_ “ Dempster, who has continued to give invaluable advice, suggesting
Ïj improvements and new experiments; to Professor A. H. Compton
his valuable criticism of the Chapters on xlrays and cosmic
Dr. L. W.AlVarez who has read much of the manuscript; …
to the various members of. the faculty at Ryerson Laboratory for
’
oççasional advice; and especially to the groups of students who
have…
and rearranged the experiments during the
‘
:
.
.
-
‘
'
-'
…
_
.
a
?
v
.
.
]. BARTÔN HOAG.î
:ÇL; RYERSQN?HŸSRÀL LABORATORY:
‘
’
-
'
:
—
'
*
‘
,
'
'
5 Ï
’
…