| Show tourie birss ress OF olp GUTTA PERCHA some interesting te experiments recently made in boston show an incredible strength in gutta percha tubing and its value above other materials for water pipes ac where power to resist great pressure is required A pipe of half an inch diameter stood pounds to the square inch and burst at a five eighths inch pipe stood till pounds of pressure to the square inch was applied but a quarter inch pipe made for soda fountains stood uninjured at 1000 to the square inch ex |
