Nice to see others have used drafting tools that I have come to appreciate. Here's a picture of pencil leads. Most of my drawing I used 6H, 3H, and 2H,, very seldom H as it smears over the velum. There a two K&E rotary lead sharpeners with refill abrasive cups, newer style K&E and Teledyne electric erasers along with two boxes of eraser refills, eraser dust brush, eraser shield, Post emery lead sharpener for compasses, standard erasers, All good stuff..

I'd think engines that big would be re-used as power for another boat project.  I can see them turning an awesome standby generator too.

Same here. A full rebuild has to be way cheaper than a new one for sure.

Not many people even know what those are anymore, much less how to use them. I got one around here somewhere that Schlumberger issued to their engineers back in the 50s. My buddy still knew how to run it too, 50 years later.

The computer has certainly made things easier. Maybe too easier? So many engineers are designing things that they have no idea how it operates.

The slide rule was used years before calculators and computers. And dates back to the 1600. “The Eagle has landed!” Armstrong's famed words upon landing on the moon. Could you guess onboard was a pocket slide rule? In fact the entire trip was made possible by the slide rule... The slide rule was king and seen in any engineering setting. Who's history along with logarithms have been forgotten. Overtaken by the newer digital age. That we rely on today..

On the top is my first slide rule made by Engineering Instruments in Peru. Indiana USA. The cost was a mere $2.00 that I used in Junior High school. That I used in not only a slide rule class; But math and science classes as well.

Prestigiousness caught up with me in High School and I purchased the Pickett Simplex Trig model N902 pictured in the middle. Made from aluminum it has a far smoother movement and a few more scales. Was Made in the USA, Chicago

Once I started engineering classes in college I purchased the the Denmarl Polylog 930 that was made in Denmark. One of the premier slide rule manufacturers of the time. Both sides having scales. It could do numerous more computations. Then followed my career as a Design Engineer. 



My slide rule as seen on my drawing table..


I'm still cannot find my 6" pocket slide rule that I relied on when going into the machine shop to discuss an issue a machinist had with the Engineering departments drawings..