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Old Sep 05, 2010, 08:47 AM
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1920 Shipbuilding Cyclopedia

Google's books scanning project has made lots of dusty old engineering tomes available, usually from university libraries... some great old stuff out there! But I continue to be frustrated at the quality of their scanning... they seem to have planned the project around typical text books, but they're unable to do justice to engineering drawings in these old books, which are often provided as multi-page foldouts. Arrgh! And I suspect that they employ bored and unmotivated undergrads to do the scanning, with predictable results.

Anyway, here are some interesting pages from the 1920 Shipbuilding Cyclopedia. I haven't figured out exactly what the purpose of the book is... it's loaded with info, with an apparent random selection of documentation on some typical ships of the day. Still, fun to leaf through!

http://books.google.com/books?id=fK8...nail&q&f=false

Note to our non-USA friends-- I couldn't find any documentation at Google about this, but I was completely unable to access these scanned books while in Germany. Maybe some regional issue over disputed copyrights?


.
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Old Sep 05, 2010, 08:49 AM
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Harbor Tug

No name, no colors, no lines. But some nice details.
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Old Sep 05, 2010, 08:50 AM
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Ocean-going Tug

ditto
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Old Sep 05, 2010, 08:53 AM
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Screw propelled river boat

no paddle wheels!
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Old Sep 05, 2010, 08:55 AM
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Twin screw towboat

Twin screw towboat
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Old Sep 05, 2010, 08:58 AM
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More riverboats...

...and details. The last two are good examples of bad scanning... these are fold out plates, with only one portion scanned!
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Old Sep 05, 2010, 09:13 AM
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The "gas producer" above seems to be a rig to make coal-gas (gas not gasoline) to feed to a spark engine.

http://commons.wikimedia.org/wiki/Fi..._Vol_II%29.jpg
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Old Sep 05, 2010, 10:01 AM
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Thanks Pat for the neat photos. Charles Ward Engineering Works (several of your riverboat diagrams) made sternwheelers also. Here are couple shots, taken from the Historic Steamboat Preservation Society calendar 2010.
www.hspsi.org
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Old Sep 05, 2010, 10:05 AM
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Interesting that the two paddlers were built in 1928 and 1930, while the twin screw design must date to before 1920. I guess some users just weren't ready for props yet?
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Old Sep 05, 2010, 10:22 AM
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I got into this over on GuardOfficer's thread :-). To summarize:
a) Alan Bates, nautical architect, is of the opinion that until you get over 500hp, a paddle is more efficient than a prop for moving large rafts of barges.
b) Prop hulls are usually of deeper draft than paddles (the Cox&Stephens NYC twin screw tunnel stern boat has a draft of 10', though the Ward W.Va. screw boat has a draft of 4'). Until the major US transportation rivers were converted into "pools", that is long lakes between dams and lock structures, only paddlers could operate in the fluctuating natural water levels of a free flowing river. The great Mississippi flood of 1927 accelerated the process of poolizing the river by the Army Corps of Engineers.
c) The biggest disadvantage of paddlers is that they can't up their hp (though bigger engines) w/o major redesign of the stern; a prop boat can simply install a greater pitch prop to accommodate a bigger engine. To hang a larger paddle, capable of handling more hp, you have to provide more buoyancy at the stern to support the greater weight of the new paddle. The towboat Sprague, largest ever sternwheeler, had a paddle of 160 tons (Way's Steam Towboat Directory, pg 209)
d) The famous tug-o-war between screw steamer HMS Rattler and the paddler HMS Alecto in 1845 was rigged. The Rattler was new (2yrs old), the Alecto was 30 yrs old. Measuring hp of marine steam engines is not straightforward (you have to look at the system, ie furnace, boiler, piping, motor, ancillary equipment, etc.), so it's hard to determine if they were evenly matched.
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Old Sep 05, 2010, 11:59 AM
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Nice stuff Pat! The steam boys will really love those old steam tugs!
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Old Sep 05, 2010, 12:12 PM
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Very cool Pat. Thanks for posting it
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Old Sep 05, 2010, 12:27 PM
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Please visit my new blog, "Google, Scan Our Drawings!", where I hope to gain some momentum behind my quest for Google to scan engineering drawings, as well as books... and at least to get them to make better book scans!
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Old Sep 07, 2010, 08:19 AM
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Couldn't agree more...

Oh, by the way, did a bit of digging as well... Found another copy of the Cyclopedia (the goog scan) at the Hathi Trust Digital Library. It's Here.

Also was wondering if there were copies at any libraries, found some at WorldCat (a worldwide library search engine.)
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Last edited by craig_c; Apr 24, 2015 at 03:09 AM. Reason: Edited working links to WordCat
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