Under tab, "Shop 931" Note states, "New Machine - Machinist W. R. McClendon demonstrates how a piece of broken tap can be removed from a valve flange through the use of the Electro Arc Metal Disintegrator recently installed in the Shipyard's Machine Shop. By the arcing process the broken tap is disintegrated, enabling the operator to lift the pieces without disassembly of the valve. May 61." Note on back states, "Navy News 24 1/2 ems May 28 issue (129546)"
Printing on side states, "MAY61". Included note states, "Two Experiments ---The installation of a ventilation system, indicated by the "chimneys", permitted 500 man shafts of work to be accomplished on the submarine Picuda (SS382) during the sandblasting and painting period. Previously no other work was performed during this period. Incident to the ventilation system is the enclosed air-lock accessed (right). The complete canvas all-weather cover permitted sandblasting and painting to continue without interference from rain, dew, and fog. Work that normally requires ten to twelve days was completed in seven."