Modern research submarines can usually carry two, three or four. There are anywhere from about 100 people on a U.S. Navy attack submarine to over 200 on one of our fleet ballistic missile boats. And some of the small early WWII boats had crews of something on the order of 60 or so. The Japanese used 2-man subs at Pearl Harbor. Bottom line: the number of crew required to operate a submarine varies with the type of boat. Need a link? You got it.
A brain drill is found in an operating room. The drill does not actually drill into the brain, it creates an opening in the skull to allow the surgeon to operate on the brain.
Nitrous oxide
the very first submarine was made in the revolutionary war and was designed to drill through the hulls of british ships and plant bombs but it failed all of its missions
A clausing drill press might not be easily operated by someone who has no experience. YouTube offers great tutorials on how to operate this machine with step by step directions available in the videos.
With your drill
It can be a drill that you operate by turning a handle on a gear wheel, or a 'brace drill which is like a U shape with a handle at right angles on one end, and a chuck at right angles on the other end.
It can be a drill that you operate by turning a handle on a gear wheel, or a 'brace drill which is like a U shape with a handle at right angles on one end, and a chuck at right angles on the other end.
My grandson could use mine when he was 8. (but he was taught properly)
People drill wells to reach fresh water.
The early submarine (the Turtle) had a screw device to drill into the ship, and a "time bomb" explosive spar (torpedo, mine) that would be attached to the hull below water.
4 probably means 3 phases power source, if you do not have this source then the drill will not operate/ One wire is earth ground.
Drill sea water?