Yes, at $7.00 made in china is only worth what we paid for.
Heavy brass is much better but is no longer available.
I do not like the folding parallel rule but I still use them for small
drawings and navigation.
See the following link:
Now days, I still carry navigation paper charts on board for back up and
The chart table (24”X24”) on my sailboat is too small to accommodate regular
size chart. We have to use the galley table. Instead I use GPS plotter
integrated with all instruments. Most of the navigation is first done on a
PC and transfer to the plotter and paper charts are use for back up when
Sorry for getting a little off subject.
Never had the chance to get there, but understand, even though the
season is short, the work to get there is worth the effort.
I'm on another sailing list with a guy from Annapolis who has cruised
I used my engineering tri-scale to measure a drawing. It is in a special long
drawer with a pull down door easy to get to.
My triangles are in the same shoulder high door.
Oh - my French curves are there as well :-)
And I only used them in High School - started with CAD on my 8080 - home brew
and continued on through Cadence PCB / IC software in the end.
Lew Hodgett wrote:
Drafting/Technical school of that day would start you on a classroom
drafting board about 18" X 24" and 36" X 24".
Those boards were only suitable for A, B, and C sizes drawing sheet (i.e.
8½" X 11", 11" X 17" and 17" X 22"). A 24 inches T and small squares were
(The one I have now is 36 inches long)
However the Ship building and Aircraft industries required layouts and
assembly drawings larger than E size drawing (34"X 44"). At that time,
corded parallel bar and T square were not adequate for an 8 foot long
drafting table. Not to mention that most of the time piles of reference
drawings were stacked at one end of the table.
The drafting tables were covered with light green grid paper similar to
The grids on the paper cover were carefully aligned parallel to the top of
and the parallism validated with the heavy brass parallel bar. The drafting
paper was translucent and the grid visible and used as references.
When no grid table cover was available the drafting paper/cotton/Mylar were
pin or tape parallel and square to the table. This procedure was not the
best but senior draftsmen had no problem with it. Subsequently the drafting
sheets were made with a printed frame and logos. It became much easier to
position the sheet square to the table. When the drafting machines became
available it took much less time to produce drawings. Now with the CAD it
like night and day.
======================================Still remember a guy on the next drafting board had to do a full size
redraw of a wing strut detail drawing on cloth with ink for a Piper
Cub type scout plane for the Air Force.
The strut was about 17-18 ft.
Definitely was not a job for a rookie which I was at the time.
I often worked on foundry automation, quarter size design layouts.
These layout drawings were usually at least 20-25 ft long, the
drafting boards were home made using 4'x10' plywood and 2" pipe.
You would start at one end of the paper and work your way to the
other, shifting the paper on the board as you went, keeping the unused
paper rolled at the end(s) of the table.
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