Im Gregory, you can call me Greg if you like :) Thanks for letting me be part of your nice email list. Surveying is fun and interesting, but the old equipment ...
Looking for a useable reproduction sextant of the type used in the 1800's. Would someone recommend a good source? I'm willing to pay a fair price for one that...
Hi Dan Try Ebay, I got quite a good one for a reasonable price. You might have to wait a while till one comes along...but it is worth it! Paul ... From:...
PAUL WANGENSTEIN
timberwyck76@...
Apr 3, 2007 8:40 pm
215
Dan, I just got off the phone with Don Erickson, who will be one of our instructors, and I asked him the same thing. He recommends the plastic ones for what we...
I will probably bring the Mark III sextant. Sounds like the repro's are not highly thought of for being useable. Just thought it would be more "authentic" to...
I'm very active with the Society for Creative Anachronism, a medieval re-creation group. I'm also an RCE & LS and want to research any information on...
... Try Apian's Instrumentbuch. This was printed in 1533 and deals with (survey) instruments and techniques from that era. It is available on-line, but without...
... to ... than ... Kon, I have used O-1 oil hardening steel for all the needles I have made thus far. I prefer a needle with some thickness 1/16" - 3/32" and...
... I have nothing to offer except that I tried the old magnet, sewing needle & cork compass floating in a bowl of water with a Cub Scout group one evening and...
Why harden the needle? Electromagnets are made from soft iron, and pole pieces I have made for permanent magnets have always been of soft carbon steel if I...
I too have made a compass needle out of O-1 tool steel as it hardens nicely and will hold its magnetism. As for the pivot, I decided to use a bearing from an O...
AEP
aepalmer@...
May 25, 2007 1:47 am
225
... be. ... My understanding and experience has shown that the hardened steel will hold its magnetism better. If you think about it, hardened tools will often...
Thanks so much for the detailed instruction! I will post the results as the work progresses this summer. Cheers, Kon ... repro ... balance. ... bulge ... have...
Mark, Came across two books you might finuseful: Galileo Galilei, "operations of the geometric and military compass" isbn 0-87474-383-4 Smithsonian, 1978. ...
Since there is no email contact for the SHS on its web site (http://www.surveyhistory.org/surveyor's_historical_society.htm), I thought this might be a good...
I am familar with George L. Hosmer who co-authored surveying text books with Charles Breed. Does anyone know of a George S. Hosmer that had anything to do with...
Dan In the copy of Breed and Hosmer I have, revised by Alexander bone of MIT, printed in 1970, he is identified as George L. Hosmer, Late Professor of Geodesy....
I just acquired a K&E "Whyteface" steel tape which is missing the pull tab on the end. If anyone has one they don't need or can tell me where to get one, it...
Dear group, A friend of mine came up with a question about a surveyor's instrument ... Can any of you help on this matter? The instrument is possibly of German...
Dear Nicolas, I invite you to contact my wife, Mary Root, who just wrote a short article about spirit levels and has additional research. She is the editor of...
I have a Topcon AG-20B Theodolite that I am looking to find a user/instruction manual for. It may not be an old unit historically but by modern digital terms...
... .................................. Mike, Hold the eyepiece up to a strong light and if it is dark, it is probably meant to be attached to the telescope...
James Kluttz
bkluttz@...
Nov 7, 2007 7:01 pm
236
... Could you send me a picture of it or post one here? Nicoląs...
I've got a picture at: http://www.iowasurveyor.com/junk/topcon-arrow.JPG I drew an arrow to what I think you may be asking about. If it's not, then sorry. I...
... It looks to me that it is the optical plummet. When yoy mount it on a tripod you will see the ground through it. It serves the same purpose as a normal...
I posted a picture of the Theodolite in the Photos section with two red arrows showing the parts I'm interested in learning about. The bottom arrow is the...
The top arrow points at what I think is a hole for electrical lighting. It will either illuminate the scales or the cross hairs or both. The eyepiece... I...
Turns out the bottom eyepiece is an optical plummet as some suggested. If anyone figures out the the top item, I'd appreciate it. Thanks for the help so far. ...
