
DavisPletts Rule
Hi Alan, Thanks for the closeups of the gauge marks on the Ln scale. This is very helpful for understanding what is going on. I believe the two lines that you highlighted at the right end of the scal
Hi Alan, Thanks for the closeups of the gauge marks on the Ln scale. This is very helpful for understanding what is going on. I believe the two lines that you highlighted at the right end of the scal

By
Eamonn
· #1766
·


DavisPletts Rule
Hi Bob, Thanks for the pointer to your LN Scale presentation. I read it and found it to be very comprehensive and well written. I especially appreciated the details regarding the gauge marks on the ru
Hi Bob, Thanks for the pointer to your LN Scale presentation. I read it and found it to be very comprehensive and well written. I especially appreciated the details regarding the gauge marks on the ru

By
Eamonn
· #1733
·


Humanity!
The Bill Robinson paper on Mendell Weinbach and the development of the 4093/4083 slide rules is the best example of a human interest slide rule story that I am aware of. Fortunately, Weinbach maintain
The Bill Robinson paper on Mendell Weinbach and the development of the 4093/4083 slide rules is the best example of a human interest slide rule story that I am aware of. Fortunately, Weinbach maintain

By
Eamonn
· #1730
·


DavisPletts Rule
Hi Alan, Thanks for the background info on Pletts. I think you may be right on the DavisPletts rule being a bit a few years ahead of its time. Given his background and his position at Marconi, Pletts
Hi Alan, Thanks for the background info on Pletts. I think you may be right on the DavisPletts rule being a bit a few years ahead of its time. Given his background and his position at Marconi, Pletts

By
Eamonn
· #1719
·


DavisPletts Rule
Good find on the Radio Review article Alan. I wonder how many more of the DavisPletts rules are out there. There a few more interesting aspects of the rule that I see. On the front of the slide is an
Good find on the Radio Review article Alan. I wonder how many more of the DavisPletts rules are out there. There a few more interesting aspects of the rule that I see. On the front of the slide is an

By
Eamonn
· #1669
·


'Proof' that the SRT Scale Is a C Scale Folded at 9 over 5 pi
Hi Alan, Maynard, Regarding the earliest rule with decimal trig, on page 18 of the paper by Bill Robinson, he mentions that K&E stated to Weinbach that K&E produced rules with decimal trig prior to 19
Hi Alan, Maynard, Regarding the earliest rule with decimal trig, on page 18 of the paper by Bill Robinson, he mentions that K&E stated to Weinbach that K&E produced rules with decimal trig prior to 19

By
Eamonn
· #1661
·


'Proof' that the SRT Scale Is a C Scale Folded at 9 over 5 pi
Hi Maynard, Yes, I also found the Bill Robinson paper on Weinbach to be really fascinating. It's great that the correspondence between Weinbach and K&E is available to provide a behind the scenes look
Hi Maynard, Yes, I also found the Bill Robinson paper on Weinbach to be really fascinating. It's great that the correspondence between Weinbach and K&E is available to provide a behind the scenes look

By
Eamonn
· #1660
·


DavisPletts Rule
Hi Alan, Thanks for sharing the info and pictures of the DavisPletts rule. That's quite a find  I was not aware of it previously. Even if it is a prototype, it appears to be well made and looks func
Hi Alan, Thanks for sharing the info and pictures of the DavisPletts rule. That's quite a find  I was not aware of it previously. Even if it is a prototype, it appears to be well made and looks func

By
Eamonn
· #1659
·


'Proof' that the SRT Scale Is a C Scale Folded at 9 over 5 pi
Hi Maynard, According to the paper "Mendell Penco Weinbach and the K&E Log Log Vector Slide Rules" by Bill Robinson, the first decimally divided trig scale was copyrighted by Weinbach in 1928. Weinbac
Hi Maynard, According to the paper "Mendell Penco Weinbach and the K&E Log Log Vector Slide Rules" by Bill Robinson, the first decimally divided trig scale was copyrighted by Weinbach in 1928. Weinbac

By
Eamonn
· #1648
·


Dating British Thornton AA010 (and others)
Hi Gabriel, Interesting that your P221 does not have markings. I have one other Thornton rule  a PIC 131 and it is stamped with 57 7  indicating it was manufactured in 1957. I have seen references t
Hi Gabriel, Interesting that your P221 does not have markings. I have one other Thornton rule  a PIC 131 and it is stamped with 57 7  indicating it was manufactured in 1957. I have seen references t

By
Eamonn
· #1588
·


Dating British Thornton AA010 (and others)
Hi Everyone. Interesting thread. I have one more P221 data point. Facing the side with the Log Log scales, it says "BRITISH THORNTON No P221 COMPREHENSIVE" on the upper left of the frame, "MADE IN ENG
Hi Everyone. Interesting thread. I have one more P221 data point. Facing the side with the Log Log scales, it says "BRITISH THORNTON No P221 COMPREHENSIVE" on the upper left of the frame, "MADE IN ENG

By
Eamonn
· #1583
·
