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\noindent{\bf Math 3226
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{\Large Off Line Springs}
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Laboratory  D}\bigskip\\
{\em Work Laboratory 4.3 in our textbook ``Differential Equations" by Blanchard, Devaney and Hall.}

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\noindent{\bf Remark.} There are  a couple of minus signs missing in the equations at the bottom of page 409! The correct equation is 
\begin{eqnarray*}
m\frac{d^2y}{dt^2}&=&-k_s \left(\sqrt{y^2+a^2}-L\right)\frac{y}{\sqrt{y^2+a^2}}\\
&=&-k_s  y\left(1-\frac{L}{\sqrt{y^2+a^2}}\right)
\end{eqnarray*}

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