walshie 2,804 Posted October 2, 2020 Report Share Posted October 2, 2020 8 hours ago, king said: You would need 1 to make a square that is a perfect square.. It would be perfect if you made one using the 345 techniique. Quote Link to post Share on other sites
Born Hunter 17,960 Posted October 2, 2020 Report Share Posted October 2, 2020 9 hours ago, baker boy said: But is it the Pythagoras theorem The 345 rule that tradesmen often use comes from the Pythagoras theorem, yeah. The theorem can be used in many more ways but the 345 rule is one solution/product of it. 1 Quote Link to post Share on other sites
king 12,038 Posted October 2, 2020 Report Share Posted October 2, 2020 45 minutes ago, walshie said: It would be perfect if you made one using the 345 techniique. Yes I imagine it would 1 Quote Link to post Share on other sites
king 12,038 Posted October 2, 2020 Report Share Posted October 2, 2020 1 hour ago, walshie said: It would be perfect if you made one using the 345 techniique. The water level is another super accurate old technology that's still used today.quite interesting.. 2 Quote Link to post Share on other sites
Daniel cain 49,398 Posted October 2, 2020 Report Share Posted October 2, 2020 2 hours ago, walshie said: It would be perfect if you made one using the 345 techniique. Spot on Dai 1 Quote Link to post Share on other sites
walshie 2,804 Posted October 2, 2020 Report Share Posted October 2, 2020 2 hours ago, king said: The water level is another super accurate old technology that's still used today.quite interesting.. I used something similar for finding the level on a patio. Glad I paid attention in physics classes. Quote Link to post Share on other sites
king 12,038 Posted October 2, 2020 Report Share Posted October 2, 2020 22 minutes ago, walshie said: I used something similar for finding the level on a patio. Glad I paid attention in physics classes. I remember a builder mate in Wales telling me about how they used to build big chappels or Churches etc. A wooden frame in the middle with a water barrel and a pipe to each corner of the building using the water level technique.then string lines corner to corner.as the building grew taller so did the barrel tower. But thinking of it maybe barrel water pressure would add to it aswell.i don't know. so even building into the side of a hill it was perfect way of leveling. Quite interesting I thought. 2 Quote Link to post Share on other sites
Lenmcharristar 10,337 Posted October 2, 2020 Report Share Posted October 2, 2020 8 hours ago, Born Hunter said: The 345 rule that tradesmen often use comes from the Pythagoras theorem, yeah. The theorem can be used in many more ways but the 345 rule is one solution/product of it. I use it for calculating roofs, stairs etc , also for squaring buildings too, theres plenty of uses it comes in for as you say 1 Quote Link to post Share on other sites
Lenmcharristar 10,337 Posted October 2, 2020 Report Share Posted October 2, 2020 4 hours ago, king said: I remember a builder mate in Wales telling me about how they used to build big chappels or Churches etc. A wooden frame in the middle with a water barrel and a pipe to each corner of the building using the water level technique.then string lines corner to corner.as the building grew taller so did the barrel tower. But thinking of it maybe barrel water pressure would add to it aswell.i don't know. so even building into the side of a hill it was perfect way of leveling. Quite interesting I thought. Water levels are great and as accurate as they come unless you get a kink in the pipe or a puncture haha, now a days the rotary, line and spot lazers are the tool for the job, you could go as far back as the ancient egyptians with the plumb bob level triangle made from wood and string 1 Quote Link to post Share on other sites
king 12,038 Posted October 2, 2020 Report Share Posted October 2, 2020 20 minutes ago, Lenmcharristar said: Water levels are great and as accurate as they come unless you get a kink in the pipe or a puncture haha, now a days the rotary, line and spot lazers are the tool for the job, you could go as far back as the ancient egyptians with the plumb bob level triangle made from wood and string That's right enough. How would they calculate say a bridge pillar that got smaller as it gained height.years ago. Maybe a wooden structure do you think.its quite interesting how they managed to work things out years ago. A programme I seen years ago about an engineer in the 1800's who's job was to tunnel under a hill for a canal.he worked it out by using a few wooden poles going over the hill.clever guy fair play. 2 Quote Link to post Share on other sites
Lenmcharristar 10,337 Posted October 2, 2020 Report Share Posted October 2, 2020 1 minute ago, king said: That's right enough. How would they calculate say a bridge pillar that got smaller as it gained height.years ago. Maybe a wooden structure do you think.its quite interesting how they managed to work things out years ago. A programme I seen years ago about an engineer in the 1800's who's job was to tunnel under a hill for a canal.he worked it out by using a few wooden poles going over the hill.clever guy fair play. Its all fascinating, again all down to structural engineering for the bridges, and a triangle is hardly ever going to tip, and all about keeping the centre of gravity inside the perimiter and tipping point of a structure Quote Link to post Share on other sites
king 12,038 Posted October 2, 2020 Report Share Posted October 2, 2020 5 minutes ago, Lenmcharristar said: Its all fascinating, again all down to structural engineering for the bridges, and a triangle is hardly ever going to tip, and all about keeping the centre of gravity inside the perimiter and tipping point of a structure So say a steeple on a church roof for instance.some are maybe 40ft + would they of used a wooden square frame with a hanging plumb Bob and every say 1ft in height.move the plumb in say 1" from the top frame towards centre and keep repeating untill they reached the top. Quote Link to post Share on other sites
Lenmcharristar 10,337 Posted October 2, 2020 Report Share Posted October 2, 2020 Just now, king said: So say a steeple on a church roof for instance.some are maybe 40ft + would they of used a wooden square frame with a hanging plumb Bob and every say 1ft in height.move the plumb in say 1" from the top frame and keep repeating untill they reached the top. No you can just draw a scaled down version and use geometry to calculate the length of the sides of the steeple and use pegs and string or a centre post with string to each corner and build to it, now how the ancient egyptians built the pyramids (if they even did) i dont know what method they used, but easily enough worked out if you have sizes to work too or from, half the span squared added to the rise squared then find the square root of those and thats the length of the longest point Quote Link to post Share on other sites
king 12,038 Posted October 2, 2020 Report Share Posted October 2, 2020 2 minutes ago, Lenmcharristar said: No you can just draw a scaled down version and use geometry to calculate the length of the sides of the steeple and use pegs and string or a centre post with string to each corner and build to it, now how the ancient egyptians built the pyramids (if they even did) i dont know what method they used, but easily enough worked out if you have sizes to work too or from, half the span squared added to the rise squared then find the square root of those and thats the length of the longest point Yea that makes sense.pity I wasn't more of a learning type in school.as I do find all building engineering quite interesting to be honest. A good programme was on before where they were building a new castle in france.25yr project using the same techniques of the day stone masons carpentry etc. And showed how they built the stone steps in a round tower.that was a good watch.. 1 Quote Link to post Share on other sites
Lenmcharristar 10,337 Posted October 2, 2020 Report Share Posted October 2, 2020 Just now, king said: Yea that makes sense.pity I wasn't more of a learning type in school.as I do find all building engineering quite interesting to be honest. A good programme was on before where they were building a new castle in france.25yr project using the same techniques of the day stone masons carpentry etc. And showed how they built the stone steps in a round tower.that was a good watch.. Always very intresting watching those programes, Quote Link to post Share on other sites
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