4 S. Xakamura and K. Honda : 



normally to the face of the recordiog cyhnder C. The position of P 

 can be adjusted by a shding piece E, and its pressure against the 

 cyhnder regulated by a spring S. We shah hereafter designate 

 this limnimeter by the letter " N." 



Before beginning our regular work, Ave endeavored to compare 

 this new limnimeter with Sarasin's at Imazu, one of our stations 

 on lake Biwa; but we soon found that they failed to give 

 concordant results though they were tried in exactly similar 

 conditions i.e. the form and size of the tanks in which the zinc 

 floats swim, and the diameter and the length of the tubes 

 connecting the tank water with that of the lake, were m.ade 

 exactly equal to one another. We found further that the rack 

 and pinion mechanism in the Sarasin limnimeter had a great 

 backlash and we were forced to dispense with this part of the 

 mechanism. When we had modified his instrument by attaching 

 the pen directly to the vertical rod of the swimmer as in our 

 instrument, and also b}^ keeping his recording parts in a vertical 

 position, the records of the two instruments agreed very 

 satisfactorily. 



The first series of observations at lake Biwa was made with a 

 Sarasin limnimeter modified as above described, and by a new 

 N limnimeter. The observations at Hakone lake, and the second 

 series of observations at lake Biwa were made with an N limni- 

 meter, and a Sarasin instrument, which was further modified by 

 entirely dispensing with his recording arragement, for which an 

 ordinary Eichard' s recording cylinder was substituted. In 1002, 

 four new limnimeters of the N type were constructed and were 

 exclusively used at lakes Yamanaka, Kawaguchi, and Hamana. 



In 1905, another portable limnimeter was designed by 

 Honda. We shall distinguish it by the letter " H " (Plate I, 



