E.E. DE BRUYN: On the Relation of the mean Sea-level and the Height of Half-Tide. 
Tidecurve at Delfzijl (Spring-tide). 
BOL. 
760 
140 a 
d zum 
100 
go 
GO 
40 
20 
AR 
IO 
40 
60 
go 
100 
120 
740 
760 
180 
200 
— — — — Mean Sea-level. 
Proceedings Royal Acad. Amsterdam. Vol. II. 
pew.’ 
ee an 
Af 
AME 
AE 
en 
Casas: 
RER ERE. 
NE ENE 
AE B 
A 
-— Half-tide. 
