Journal Royal Society of N.S.W., Vol. XXX, 1896 PLATE 5. 
(Engineering Section.) = = 
FIRST 3 eae : ee : 
USED AT AMSTERDAM SnHip CANAL. 
1870. hs 
— LADDER DREDGE —— 
USED AT AMSTERDA oe 
CANAL WITH PUMP ATTACHED FOR FORCING SAND 
THROUGH PIPES TO SHORE. 
ee 
Scetesecces 
* 
ic Bh, 
* $ * 
nn oHveE eee nen ane oO PSS rTho 
UK: \ 9 
9 
Ww s 
eoeemermececenemenes ans anh os0 2% 9 
‘URED PERRET TH 
Ee 
ve." 
a 
taeapanadie 
