Before revision: Two small technical changes lead to variations with more mechanical parts : The Ekman Grab Sampler does not close the shovels instantly on ground contact, but a messenger weight has to be sent down in order to release springs and take the sample.
After revision: Threeor structure small technical changes lead to variations with more mechanical parts : The Ekman Grab Sampler does not close the shovels instantly on ground contact, but a messenger weight has to be sent down in order to release springs and take the sample.