Cleaning SX 2 I have come across 3 brand new spark plugs ( thought they were used ) along with 100 metre roll of strip chart recorder paper and thought subject may be of interest .
The roll fits into my 1960 Furuno 200 Mark -3 fish finder.
The pick up (since removed ) was under the hull and sent to the unit which recorded by needle on to the moving paper .
It is 30 x 20 x 15cms and weighs about 6 kgs .
Has nothing in common with today's lightweight colour units