| Show strength OF or GUA gira PERCHA same interesting experiments made in lit boston show an almost incredible strength E nath ij in n gutta gutla percha tubing and its value above other materials for water pipes etc where power to resist great pressure 19 required A pipe of half an inch diameter stood pounds to the square inch in chand and hurst fit kit a five eighths inch pipe stood till pounds of pressure to the square inch was wag applied but a quarter inch pipe made for soda fountains stood uninjured 1000 to the square inch |