Irina's edits

1 files changed, 7 insertions, 7 deletions

diff --git a/ediffract_new.tex b/ediffract_new.tex
index 8ace7bf..5e727c6 100644
--- a/ediffract_new.tex
+++ b/ediffract_new.tex
@@ -35,7 +35,7 @@
 
 \begin{figure}[h]
 \centering
-\includegraphics[width=\textwidth]{./pdf_figs/ed1_new} \caption{\label{ed1}Electron
+\includegraphics[width=0.6\textwidth]{./pdf_figs/ed1_new} \caption{\label{ed1}Electron
 Diffraction from atomic layers in a crystal.}
 \end{figure}
 \section*{Theory}
@@ -88,7 +88,7 @@ electron diffraction tube, make sure these connections are well-protected and
 cannot be touched by accident while taking measurements.
 \begin{figure}[h]
 \centering
-\includegraphics[width=6in]{./pdf_figs/ed2} \caption{\label{ed2}Electron Diffraction Apparatus.}
+\includegraphics[width=5in]{./pdf_figs/ed2} \caption{\label{ed2}Electron Diffraction Apparatus.}
 \end{figure}
 \subsection*{Setup}
 
@@ -126,9 +126,9 @@ Anode Current & $I_A$& 0.15 mA at 4000 V ( 0.20 mA max.)
 \item  Slowly increase $V_a$ until you observe two rings appear around the direct beam.
 Slowly change the voltage and determine the highest achievable accelerating
 voltage, and the lowest voltage when the rings are visible.
-\item  Measure the diffraction angle $\theta$ for both inner and outer rings for 5-10 voltages from that range,
-using the same thin receipt paper (see procedure below). Each lab partner should
-repeat these measurements (using an individual length of the thin paper).
+\item  Measure the diffraction angle $\theta$ for both inner and outer rings for 8-10 voltages from that range,
+using the same strip of a masking tape (see procedure below).
+\item Turn the voltage down, take a new masking tape and repeat the measurement procedure, using the same values of $V_a$ at least two more times.
 \item Calculate the average value of $\theta$ from the individual measurements for each
 voltage $V_a$. Calculate the uncertainties for each $\theta$.
 \end{enumerate}
@@ -150,10 +150,10 @@ where the distance between the target and the screen $L = 0.130$~m is controlled
 The ratio between the arc length $s$ and the
 radius of the curvature for the screen $R = 0.066$~m gives the angle $\phi$ in
 radians:  $\phi = s/2R$. To measure $\phi$ carefully place a piece of
-thin receipt paper on the tube so that it crosses the ring along the diameter.
+a masking tape on the tube so that it crosses the ring along the diameter.
 Mark the position of the ring for each accelerating voltage, and then
 remove the paper and measure the arc length $s$ corresponding to
-each ring. You can also make these markings on masking tape placed gently on the tube.
+each ring. 
 
 
 \begin{figure}