Add slide rule warm-up

src/Warm-Ups/Slide Rules/parts/0 logarithms.tex

@@ -1,9 +1,5 @@
 \section{Logarithms}
 
-\definition{}<logdef>
-The \textit{logarithm} is the inverse of the exponent. That is, if $b^p = c$, then $\log_b{c} = p$. \\
-In other words, $\log_b{c}$ asks the question ``what power do I need to raise $b$ to to get $c$?'' \\
-
 \problem{}
 Evaluate the following by hand:
 
@@ -39,9 +35,9 @@ Prove the following:
 
 \begin{instructornote}
 	A good intro to the following sections is the linear slide rule:
-	\note{(note that these rules start at 0)}
+	\note{Note that these rules start at 0.}
 	\begin{center}
-		\begin{tikzpicture}[scale=0.5]
+		\begin{tikzpicture}[scale=0.6]
 			\linearscale{2}{1}{}
 			\linearscale{0}{0}{}
 
@@ -57,7 +53,7 @@ Prove the following:
 
 	\linehack{}
 
-	After assembling the paper slide rule, you can make a visor with some transparent tape.
+	After assembling the paper slide rule, you can make a visor with some transparent tape. Wrap a strip around the slide rule, sticky side out, and stick it to itself to form a ring. Cover the sticky side with another layer of tape, and trim the edges to make them straight. Use the edge of the visor to read your slide rule!
 \end{instructornote}
 
 \pagebreak