THE TIDES. 179 



Meteorological Committee, and is now regularly 

 at work at their office, harmonically analysing 

 the results of meteorological observations, under 

 the superintendence of Mr. R. H. Scott. 



Fig. 28 represents the tidal harmonic analyser, 

 constructed under the author's direction, with the 

 assistance of a grant from the Government Grant 

 Fund of the Royal Society. The eleven cranks 

 of this instrument are allotted as follows : 



The general arrangement of the several parts 

 may be seen from Fig. 28. The large circle at 

 the back, near the centre, is merely a counter to 

 count the days, months, and years for four years, 

 being the leap year period. It is driven by a 



N 2 



