| Show THEIR ESTIMATES TOO LOW proof that engineers have erred in their figures concerning the weight of crowds interesting experiments were made some time ago at harvard university which seem to demonstrate that engineers usually underestimate the maximum loading caused by dense crowds on off bridges floors and platforms forty nien men averaging pounds in weight eight placed in a box six feet square caused an average pressure of ISI pounds to the square foot on the floor an engineer has estimated the weight per square foot of the densest crowds on the new kew york elevated railways at only 45 43 pounds but since the harvard experiments the opinion has been expressed vint that the maximum loading on oil the elevated cars and platforms may mav be nearer than 45 pounds this applies to other close packed crowds |
