Page 290 - Green - Maritime Archaeology: A Technical Handbook. 2nd ed

Chapter 9: Excavation 269
a
b
Figure 9.21 Explosives used on Batavia wreck site, Western Australia. (a) Placing charge on iron cannon ball concretion, the two white squares have small quantities of gelignite taped to a thick rubber mat, and (b) shows the charge exploding. (Courtesy of Patrick Baker, Depart- ment of Maritime Archaeology, Western Australian Maritime Museum.)
then, if need be, load directly onto a transport vessel (Figure 9.23). Where it is necessary to bring material onto the lifting platform, some form of inboard swing is required. This can range from a simple swivel davit to an A-frame, and ultimately to a hydraulically operated, articulated arm.