LONGITUDE OF McGILL OBSERVATOET. 



173 



PAET HT. 



lu Table VI, the second and sixth columns give the corresponding means of readings 

 at every fifth second for each minute of the comparison of the two clocks. These com- 

 parison readings were made with a scale graduated to tenths of a second, and the readings 

 were estimated to hundredths of a second. The third column is obtained directly from 

 the second by means of the data in the Nautical Almanac. The clock corrections are from 

 Table III, by applying the rates there given. The fifth and eighth columns give the sums 

 of the two previous columns and the last column is the difference for each minute of the 

 Cambridge and Montreal sidereal times. 



Table VI. — Exchange of Clock Signals. 



Sec. III., 1885. 23. 



