Standard Tape

Does anyone know what brand of diamond in a standard tape measure 19 3 / 16 ", 38 3 / 8" is for?

The mark diamond in a standard measuring tape is the tape around and wondered what the meaning of it. I work for a cabinet installation company and our installers did not know.

The branded diamond is actually called positioned exactly at 8 / 5 of a foot (that is exactly 1.6 or 19.2 inches, which is in fact very about 19 "3 / 16). The brand of diamonds are also called" black truss "markings, as they relate to the disposition of armor that is used with 8-foot sheets of plywood (or other), ie 5 trusses per sheet. This is contrasted with the "Red Stud trademarks appearing every 16 inches by inches showing the correct number in red instead of black. Black marks and red marks coincide in intervals of 8 meters (96 inches). Ie that the intervals 5 black and 6 red for a width of 8 meters. 5 / 8 = 0,625 is a standard for a roof slope, which therefore can be constructed by measuring horizontal so many diamonds as there are vertical feet. The ratio of 8 / 5 = 1.6 is very close to the so-called Golden Ratio, which has been widely used in architecture since antiquity ... The golden ratio is the aspect ratio of a rectangle whose long side is the smaller side so that the sum of the two parties is the largest side. It is also equal to the diagonal of a regular pentagon of unit side. Its exact value is (1 + sqrt (5)) / 2, which is approximately 1.618034

Standard Tape

Standard Tape