. A comparison of the chemical and physical properties of vitrified bricks. A/o/jc/vorsf/ JO - y€> i/XA/Joi/p^. REFEREITCES. 16 Iowa Geological Survey,Brick, „. Vol. XIV. Engineering Record .................. February, .................. September, .................. June, March, . ... Feb. 3rd., Municipal Engineering, March, , April, , Ilovember, 1896. Clay Record, ..,......,,, June, 1896. .,-,.... , .April, 1897. .October, 1398. March, 1899. Technograph May, 1896. Digest of Physical Tests, April, 1896. Paving and Municipal Engineering, January, 18
. A comparison of the chemical and physical properties of vitrified bricks. A/o/jc/vorsf/ JO - y€> i/XA/Joi/p^. REFEREITCES. 16 Iowa Geological Survey,Brick, „. Vol. XIV. Engineering Record .................. February, .................. September, .................. June, March, . ... Feb. 3rd., Municipal Engineering, March, , April, , Ilovember, 1896. Clay Record, ..,......,,, June, 1896. .,-,.... , .April, 1897. .October, 1398. March, 1899. Technograph May, 1896. Digest of Physical Tests, April, 1896. Paving and Municipal Engineering, January, 1896. Engineering Apr. 9th, 1896, 17 Discussion OF THF RESULTSOBTAIIIED FROM PHYSICAL TESTS. RATTLER TEST. The rattler teat for paving brick has corie to beaccepter! as most reliable for rtetermining theit abilityto hard \;3uage. It is supposed, to subject to the sairie and tear as the^^ receive in actualuse from the of the horses hoofs, and grindingcaused by the wheels of vehicles. In the rattler test thebrick pouno. against each other, the sides of the r
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