228
N. A . HOLME
FIQ. 31. Sampling from an icehole hut in McMurdo Sound. A Phleger corer is being
prepared for lowering, while an Ekman current meter is suspended over the hole
on a second wire. (From Tressler and Ommundsen, 1962. Official U.S. Navy
Photo.)
IX. ANCILLARY GEAR
Developments in electronic and sonar gear have given greater
precision to work at sea, both in position finding, depth recording, and
in manipulation of the gear under water. These techniques will not be
described in detail here, but appropriate references are given.