Zapper, post: 407739, member: 6470 wrote: More accurate than a wingding...
I was never sure of that. I could never understand why they did not have cross hairs.
John Putnam, post: 407833, member: 1188 wrote: I was never sure of that. I could never understand why they did not have cross hairs.
We always had a right angle prism or two in the truck and used them very little; it is surely an acquired taste.
I picked up a habit years ago from an old boss for the procedure of pulling offset stakes from a CL point: Rather than a "hooey" (a "wingding" in Okie-speak) we would 'two tape' the offset stake's location from the previous stake and the new cl. We even had a laminated chart in the truck for different radius chords so we could two-tape stakes in curves. Very, very tidy and when staking much quicker than those silly right angle prisms.
That square spike with the pyramidal point is what we used to use at the city where I worked for centerline points. Great for asphalt paving.
They are impossible to find now.
A boat spike has a a rounded head and is usually galvanized.
makerofmaps, post: 407760, member: 9079 wrote: Gosh now I feel like a dino. I laid out many miles of roads in Pinellas County with one of those but then found I could slap a 90 just as good. for rough staking. We would set one side with the transit than chain to the other side. Then run a level with a linker rod to mark the elevations. even did that for blue topping sometimes if there was no curbs involved. Never trusted the total station for elevations back then.
I also surveyed many miles in Pinellas County. I worked on 580 and 19 back in the late 70's. Also a lot of road work along stretch of road from Dunedin to Indian Rocks and beyond....
I keep my sidways-looky-thing in my truck but haven't used it in a few months.
We used a right angle prism to set many miles of slope stakes, grade stakes, blue tops, etc, mostly 4 lane with depressed median, interstates included. This was all prior to edm and gps. Had a 5 man crew, had to run in cl every 50' first. Put in a nail at each station, drove the truck down the line dropping out whatever stakes were needed. One man went in front and would mark the stations on the stakes while holding one on the nail for a sight, then toss the stakes out toward where they went. Behind was a guy with the dumb end of the tape and right angle prism and a stake or 4' line rod. Set the rod on the nail, lined up the guy on the other end of the tape. Then the other 2 got their location off the tape, and all 3 drove their stake. Go down one side and back up the other. Coming back just lined across. If bluetopping we'd stick the hubs where they went, then come back with a hammer guy and rodman in each lane and drive to grade while party chief read both rods. Used Lenker rods to keep from having to figure them.
We used a right angle prism to set many miles of slope stakes, grade stakes, blue tops, etc, mostly 4 lane with depressed median, interstates included. This was all prior to edm and gps. Had a 5 man crew, had to run in cl every 50' first. Put in a nail at each station, drove the truck down the line dropping out whatever stakes were needed. One man went in front and would mark the stations on the stakes while holding one on the nail for a sight, then toss the stakes out toward where they went. Behind was a guy with the dumb end of the tape and right angle prism and a stake or 4' line rod. Set the rod on the nail, lined up the guy on the other end of the tape. Then the other 2 got their location off the tape, and all 3 drove their stake. Go down one side and back up the other. Coming back just lined across. If bluetopping we'd stick the hubs where they went, then come back with a hammer guy and rodman in each lane and drive to grade while party chief read both rods. Used Lenker rods to keep from having to figure them.
Allen Wrench, post: 407731, member: 6172 wrote: I recently took a job in the government sector, and being the only surveyor in a dying program, I inherited a shed full of old equipment from the program's heyday. Most of these things I know what they are, but never used personally, however:
The attached picture has two objects I'm wondering about. First, there are boxes of these square shank nails, that I have no idea what they're used for. Sometimes nails are just nails, but do these have a particular use in the survey world? Second, there was this weird tiny prism with a notch in the shank, like a bishop in a chess set. I'm guessing it hangs on a stringline, and then you can shoot it with a total station? I don't know.
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Going with right angle prism, certainly not any type of boat spike I've seen, they typically have a much larger head, but certainly a durable weapon for pinning a position down.
paden cash, post: 407836, member: 20 wrote: We always had a right angle prism or two in the truck and used them very little; it is surely an acquired taste.
I picked up a habit years ago from an old boss for the procedure of pulling offset stakes from a CL point: Rather than a "hooey" (a "wingding" in Okie-speak) we would 'two tape' the offset stake's location from the previous stake and the new cl. We even had a laminated chart in the truck for different radius chords so we could two-tape stakes in curves. Very, very tidy and when staking much quicker than those silly right angle prisms.
We would use rut angle mirrors daily for construction layout, every crew member had them on their belt. Jp
A right angle prism and a concrete nail
Mostly we would flop an Arkansas 90å¡ (stand on your station, look directly right or left, point at the BS with one hand, point at the FS with the other and clap your hands to look at line to your offset)
I have a Leitz offset prism and have used it extensively on my own.
With steady hand as in using a plumb bob to give a site, it is possible to achieve good results.
John Putnam, post: 407833, member: 1188 wrote: I was never sure of that. I could never understand why they did not have cross hairs.
The right angle glass with two pentagonal prisms, as in Kent's link, generally had a piece of clear glass between the left-hand and right-hand prism. That was for looking straight ahead. If other crew members held lath or rods ahead and to one side, you could line them up pretty accurately. Meanwhile you used a plumbbob to keep yourself on the occupied point. The triangular right angle glasses were less accurate.