The 6th edition of the book I referenced above is year?ÿ1981. Another book would be The Transition Spiral and its Introduction to Railway Curves, by ...
@loyal Like your work Loyal. If Bill93 would read some survey books he would fine out how the Spirals were done in the field. If he would...
The Searles Spiral is one of many . When Highways were being built I had read an article about Superelevation and spirals back in?ÿ around 1958. I th...
Loyal,?ÿI would play with?ÿC&GS FORM 128?ÿbefore I would play with this stuff. I do have quite amount of information on Spirals?ÿbut?ÿGeodesy is ...
WildT2?ÿ ?ÿyou will want part number 380879 (diagonal eyepieces) for your?ÿnew style T2. ?ÿ JOHN NOLTON
WildT2?ÿ ?ÿcheck ebay. There are some there but I have not looked close to see which style T2 they fit. Even the old style T2 had a different one for...
@palas-tcrt I infer you are talking about the tripod being "decorative". If I was going to buy this inst. I would not want your tripod and would wan...
@bill93 So Bill93 do you have problems with grads? Do you have problems with inverted image? I have NO problem with either. The tripod is junk and t...
@loyal Thanks Loyal. I was sure that's what he wanted but a more complete sentence would be better. Plus what the hell is a surveyor(?) going to the...
Why don't you give us the Instrument type and then we could give the correct ppm correction? ?ÿ JOHN NOLTON
This is the Big news story carried by a lot of different agency's. One said that China will use their GPS system (BeiDou) and aerial gravity plus oth...
@sireath I have only used optical plummets myself. On a job with NGS we would use a Kern (1/100,000) OP but the largest Bilby tower on that job was&...
@andy-bruner No problem Andy. I do the same thing. Hope all is well with you. JOHN NOLTON
@norman-oklahoma There are many accurate Laser plummets for both Zenith and Nadir(money). + or - 1mm in 100 meters. No specifications as to accurac...
@andy-bruner The Kern instruments were green even before 1980. JOHN NOLTON
@stephen-ward Exactly Stephen. You should not see any difference even when the nodal point prism is off by 15 degree's and you have done the e...
Just for information I quote from a AGA paper; "Eruption claims life of U.S. geologist The original shattering explosion of Mt. St. Helens claimed t...
@stephen-ward Stephen the correction for a OLD STYLE AGA PRISM that had a minus 30mm constant (not really constant but close) was around&n...
It would take too long for me to type up an answer for you. Look at the following 2 places to get started. ?ÿ itrf.ensg.ign.fr?ÿ and do a search in ...
Never liked the jerk. He LIED about serving in the Military and being in Vietnam. I have NO respect for him. ?ÿ JOHN NOLTON Vietnam VET
