http://groups.yahoo.com/group/DrawingInstruments/ Drawing Instruments Wed, 24 Apr 2013 07:52:48 GMT danlinealis http://groups.yahoo.com/group/DrawingInstruments/message/3815 http://groups.yahoo.com/group/DrawingInstruments/message/3815 Hi John, This is the original case. The clean design of Baraban-Thomas proportional divider and this case had interested me much. Dan Tue, 23 Apr 2013 08:23:34 GMT David Riches http://groups.yahoo.com/group/DrawingInstruments/message/3814 http://groups.yahoo.com/group/DrawingInstruments/message/3814 Ron, Eric, One particular use was for establishing position from three landmarks when conducting hydrographic surveys. The angles between adjacent landmarks Tue, 23 Apr 2013 03:39:25 GMT ecoyle@... http://groups.yahoo.com/group/DrawingInstruments/message/3813 http://groups.yahoo.com/group/DrawingInstruments/message/3813 Ron.. As far as I know, the three arm protractor was a maritime navigational aid which allowed a ship to stay on station. It’s been years since I researched Sun, 21 Apr 2013 16:20:03 GMT planimetrica http://groups.yahoo.com/group/DrawingInstruments/message/3812 http://groups.yahoo.com/group/DrawingInstruments/message/3812 Hi Dan, Interesting planimeter. A quick translation from the patent description: To determine the surface area of figure `x' (fig. 1), using pointed cursor Sun, 21 Apr 2013 15:01:47 GMT ronbo717 http://groups.yahoo.com/group/DrawingInstruments/message/3811 http://groups.yahoo.com/group/DrawingInstruments/message/3811 I acquired a Tamaya 3 arm protractor recently and uploaded photos of it in my Ron Blauch photo folder. The age is a question. I'm guessing around WW2 era. Sat, 20 Apr 2013 05:50:46 GMT Dan Linn http://groups.yahoo.com/group/DrawingInstruments/message/3810 http://groups.yahoo.com/group/DrawingInstruments/message/3810 Hi Ken, Right on....exact match to the squib on the tool...many thanks... Dan Sat, 20 Apr 2013 03:36:13 GMT collectingken http://groups.yahoo.com/group/DrawingInstruments/message/3809 http://groups.yahoo.com/group/DrawingInstruments/message/3809 Dan, It sounds like the Kern logo to me. You can compare it to examples shown on this web site Sat, 20 Apr 2013 03:21:57 GMT lsd300 http://groups.yahoo.com/group/DrawingInstruments/message/3808 http://groups.yahoo.com/group/DrawingInstruments/message/3808 I have a pair of bent point proportional dividers with no name, but a small logo that is a "K" inside of a "regular" dividers... Anyone know that maker?? Thu, 18 Apr 2013 09:01:32 GMT David Riches http://groups.yahoo.com/group/DrawingInstruments/message/3807 http://groups.yahoo.com/group/DrawingInstruments/message/3807 Thanks John, It is indeed a Patent Chart Course Indicator - see http://collections.rmg.co.uk/collections/objects/42304.html The National Maritime Museum Wed, 17 Apr 2013 13:22:34 GMT David Riches http://groups.yahoo.com/group/DrawingInstruments/message/3806 http://groups.yahoo.com/group/DrawingInstruments/message/3806 I have posted pictures in my album of a Lilley & Son protractor I have just obtained that is a type I have not seen before and would welcome any information. I Wed, 17 Apr 2013 13:21:15 GMT planimetrica http://groups.yahoo.com/group/DrawingInstruments/message/3805 http://groups.yahoo.com/group/DrawingInstruments/message/3805 David, This protractor seems to fit the description of the Patent Chart Course Indicator. Wed, 17 Apr 2013 12:58:08 GMT planimetrica http://groups.yahoo.com/group/DrawingInstruments/message/3804 http://groups.yahoo.com/group/DrawingInstruments/message/3804 Posted is a drawing set by Amsterdam royal instrument maker A.J. Schokking Jr. (1837-1903). The set features a wide jawed ruling pen, often called a `Van Wed, 17 Apr 2013 09:10:42 GMT planimetrica http://groups.yahoo.com/group/DrawingInstruments/message/3803 http://groups.yahoo.com/group/DrawingInstruments/message/3803 Ken, Thanks for the link and your comments! David, Thanks for posting this page from the Richter 1928 catalogue! Ron, There must have been a need for these Wed, 17 Apr 2013 02:06:37 GMT ronbo717 http://groups.yahoo.com/group/DrawingInstruments/message/3802 http://groups.yahoo.com/group/DrawingInstruments/message/3802 Whenever I get to thinking there isn't much I haven't seen, there's always another better idea, another ingenious device. They don't always stand the test of Tue, 16 Apr 2013 04:24:12 GMT collectingken http://groups.yahoo.com/group/DrawingInstruments/message/3801 http://groups.yahoo.com/group/DrawingInstruments/message/3801 John, Congratulations on a great find. This pen did appear in the 1928 Richter catalog which David had previously scanned here: