The equipment used to measure the depth of water by measuring the time it takes for a pulse of sound to travel from source to sea bottom and return:
AEcogram
BEcho sounder
CDistomat
DSonogram
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When it is not possible to set up the level midway between two points. The method of leveling to carry forward the levels on the other side of the obstruction is called :
ഒരു റോഡ് ജംഗ്ഷനിൽ ചെല്ലുമ്പോൾ കടന്നുപോകുന്നയാൾ മുൻഗണനകൊടുക്കേണ്ടത് :
Invar tapes are used for taking accurate measurements because