DEPTH FINDER hand sounder

BRAND
DEPTH FINDER
MODEL
tube model
TYPOLOGY
manual sounder
USES
it indicates the depth to which it is lowered from the surface
BODY
transparent tubular body
SPECIAL FEATURES
the scale in meters indicates heights up to -150
NOTE
lowering it below the surface, the water enters the tube compressing the air inside and remains trapped in it; sailing it, its level indicates on the graduated scale the depth reached - a pressure valve allows the emptying of the tube
COUNTRY OF ORIGIN
Uk
YEAR OF PRESENTATION
1965
SOURCE
catalogs