NARRATIVE OF THE CRUISE 



299 



The Pendulums of the Vening-Meinesz Gravity-apparatus 



Installed on the Carnegie at San Francisco to obtain measurements of the force of 

 gravity in different parts of the world, which are of great interest to geophysicists in their 

 study of the Earth's crust — these pendulums are made of "invar," an alloy which does 

 not contract or expand with changes in temperature. 



