Hello,I would like to thank everyone who has sent in a bid for the sale of the collection of my father Georg Schreiber. This is to inform all of you that ...

Another correction:  I'm sure that several of you noted that the pictures and texts on the verse of the Plastograf stadia rule ar not instructions but a set of ...

Hi tio all, I think all of you, except me, saw the name of the manufacturer in the photo of the back of the unknown topographic ruler that I put ...

Hi to all, I added two pictures on the albul of the Octolog 11-D showing the clever construction of the rule to allow remove/place again the cursor.Best regards,João Roberto 

Hi Dave,very thanks for the answer. Well, have made the unsubscription in the email option, but  sometimes this method doesn't work. Let's ...

Joao,Same way as you un-subscribe from any list. In an e-mail received in you corporate click on the “unsubscribe” link.Dave 

Hello,It is a off-topic message: when I make a acces to groups.io to place pictures I was logged in Google with my corporate e-mail, and by chance I registered the ...

Hello Jorge,What a interesting coincidence! Two of the 3 albuns created by me in the group are to topographic slide rules!Best regards,João Roberto Gabbardo Enviado do Yahoo Mail no Android ...

Hello everybody!!!    Announced in the ARC Forum a detailed study by Gonzalo Martin (C.E.O of Photocalcul.com) on the Topographic Slide Rules in France, focused on Moinot, Goulier and Graphoplex models.   Presentation shown ...

Hi Jerry and all,really the left side of the picture became unfocused. I scanned the tabels and updated the pictures. Now you ...

Hi to all, I created 3 new albuns in the https://groups.io/g/sliderulePictures1 with photos of interesting rules of my collection. I hope you like them.Best regards, João Roberto Gabbardo  sliderulePictures1 groups.io GroupThis group ...

And they are (mostly) good pictures. Perhaps the left-hand end of number 8 could be rescanned and posted separately?The "heiroglyphs" at the ...

Hi Andreas, Thanks for share the link to the pictures.Best regards,João Roberto GabbardoEnviado do Yahoo Mail no Android

Thank you, Andreas!Regards, Jerry McCarthy, U.K. ...

              Development History of the Slide Rule", by Jihei Miyazaki               is ...

I have become interested in a special Hemmi slide rule that I have come to possess.  On the ISRM site it is referred to as the "Byoutou" slide rule.     https://sliderulemuseum.com/Hemmi.htm   (search ...

Hi Akatsuki,I have incorporated your image into Bill Robinson's Archive.Best wishes,Rod

Hi,after playing a little with the Jiangshi, I still struggle with it. Itcan be used in a quite standard way as a LogLog slide rule, with aninteresting exception, that it ...

PS:Robinson notes that it is unknown, why the width of the two versions aredifferent. I believe to see why: The second version has more space upand down of the respective ...

Hi,after playing a little with the Jangshi, I still wonder about theprecision though obviously very simple construction.To the other owners of a Jangshi: what about the precision of your copies?It ...