%\begin{table}
\begin{center}
\begin{tabular}{lcl}
Speed & - & Encoded speed of light in air. Add 299800 to get km/sec scale.\\
Beat & - & Number of beats per second between forks. \\
Cor & - & Correction for temperature to standard fork in beats per second. \\
Day & - & Day of experiment in progress (June 5 = 1). \\
Diff & - & Difference between greatest and least values of revolutions.\\
Qual & - & Quality of the image I. The more distinct it is the higher
	the quality (3 = good, 1 = poor). \\
Disp & - & Displacement of image I from slit S in micrometer divisions. \\
Image & - & Micrometer position of deflected image.\\
Radius & - & Radius of measurement, in feet. \\
Revs & - & Number of revolutions per second.\\
Screw & - & Value of one turn of the screw in millimetres. \\
Slit & - & Micrometer position of slit. \\
Tday & - & Time of day observation recorded (AM = 1 hour after sunrise, 
PM = 1 hour before sunset).\\
Temp & - & Air temperature in degrees Fahrenheit. \\
Remarks & - & 1. Electric light. \\
&& 2. Frame inclined at various angles. \\
&& 3. Set micrometer and counted oscillations. \\
&& 4. Oscillations of image of revolving mirror. Probably PM.\\
&& 5. Readings taken by Lieut. Nazro. \\
&& 6. Readings taken by Mr. Clason. \\
&& 7. Mirror inverted. \\
&& 8. Mirror erect. \\
\end {tabular}
\end{center}
%\caption{Definition of variates.}
%\label{table:michelson-key}
%\end{table}