Now all this is happening in total darkness, in the North Atlantic is lightly rough seas. Several crew members were dispatched topside to investigate. Just by luck, as we were making a maneuver, one of the lookouts noticed something white behind the boat. However, old diesel boat engines exhausted sea water coolant and exhaust smoke (we called it “efficiency haze” from the sides of the boat, making it hard to see anything further back from there. The chief notified the lookouts on the bridge to look aft towards the engine rooms. Being rather peeved, the next time I called the chief, I used some rather profane language (something I rarely did). A few minutes later the tapping was back, so I reported it to the chief of the watch in control, but no one seemed to believe me. Well, about an hour into my watch, I thought I heard the faint sound of something tapping on the hull, but instantly dismissed it. That’s probably why I could enjoy the music at Woodstock. At around midnight, I got up and made it back to the after engine room to start my six hour watch.Įven with both diesel engines running as well as the two in the forward engine room, I never wore hearing protection. So, we stayed on the surface and searched and searched well into the night with no success. You never realize how vast the Atlantic is until you have to look for one lone human being. Then on the USS Croaker two years later, while transiting the Atlantic ocean for our four month Mediterranean cruise, we received a message that one of our planes had gone down and we were ordered to search for the pilot who had successfully bailed out. Had it not been for a curious shipmate, we probably would have dragged the SEAL team back out into the deeper ocean waters where we would have gone a lot deeper than periscope depth. Just by accident, our quartermaster wanted to see the shoreline before we got too far out and snuck a quick look out the scope before lowering it. Since our part of the mission was seemingly over, at least until we were supposed to rendezvous to retrieve the team, we started heading back out to sea. Because the raft was sinking, they did not detach it from the scope. There was no communication with the team once they left the boat, so we had no idea what was going on. All went according to plan except when the SEALS detached their raft, and got into it, it started to sink. When we reached the insertion point, the seals were supposed to exit the boat through our forward escape hatch, swim to the surface, get in their raft and paddle to the shore. Our mission was to secure their raft to our periscope fairing and then submerge and transit into a coastal shore line as close as we could under cover of darkness. Now, they were in the process of honing their skills in covert insertions using submarines. Usually the UDT teams were culled from the navy seabees or construction battalions. The SEALS had just been formed as a special forces group a year earlier from the navy Underwater Demolition Team or UDT. When the flats become large enough to cause distortion the tip my not be doing any meaningful damage.Once on the USS Piper back in 1962, we were operating with a group of navy SEALS.
a new tip to compare against will be of help here. This takes skill and experience to have any meaningful optical determination. The square area (per Shure) may not apply with advanced tip shapes. an ML or MR will show much the same reflections until the ridges are worn down enough to contact the shoulder cuts or bottom out in the groove at the tip. all needles would shred your records if this was not the case with any minor wear.Ī true elliptical should last longer than a bi-radial or conical in this respect. The wear is predominately flat but there is a radius adjacent to the flats. Move the light source around to determine the flats from the radius. a point source lighting source (fibre optic) will be of immense aid here. If you flood the lighting with a diffuse source the curved areas will light up and skew your readings. I still have trouble determining stylus wear with this setup. This will get me to 280x optical with a 2x Barlow lens and 20x eyepieces. I've had a nice stereo microscope for about ten years, a Bausch and Lomb Stereozoom seven.
0 kommentar(er)
