WEST VIRGINIA GEOLOGICAL SURVEY. 603 



Rattler Test. 



No. of Weights, Ibs. 



Brick Initial. Final. Per cent. Lost 



12 64.18 39.86 62.1 



Absorption. Wet. 



Per cent. Dry, Ibs. Ibs. Gain, Ibs. 



0.2 18.98 19.02 0.4 

 Brick were burned at too high temperature causing them to fuse and 



stick together. Had to be broken apart. Rattler test probably high 

 on account of sharp corners." 



Gray Shale. 



"No. 101. Received June 16, 1915. Name, Weston Brick Works. 

 Date sample mixed, Aug. 14, 1915. Pressed, Aug. 28th. Put in kiln, 

 Sept. 25th. Position in kiln, top. Time of burning, 288 hours. Tem- 

 perature, about 2200 F. Removed from kiln, Oct. 14th. Kind of brick, 

 Testing Specimens. Color and general appearance, red and white. Di- 

 mensions of brick, 2 1 /&"x4"x8". 



Transverse Test. Crushing Test. 



Distance Between Supports 7" 



Break- Modulus Area Breaking Load. 



No. Dimen- How ing of of Lbs. per 



sions. Set Load Rupture Section Total sq.inch 



1 2.6x3.9x7.9 Edge 4365 1158 3.9x7.9 112980 3667 



2 2.4x3.9x7.9 Edge 2650 742 3.9x7.9 109100 3540 



3 2.4x3.9x7.9 Edge 1345 379 3.9x7.9 158130 5132 



Rattler Test. 



No. of Weights, Ibs. 



Brick Initial. Final. Per cent. Lost 



12 69.56 0.34 99 



Absorption. Wet, 



Per cent Dry, Ibs. Ibs. Gain, Ibs. 



6.4 29.46 31.37 1.91 



The tests of shrinkage and porosity as made by the U. S. 

 Bureau of Standards were furnished Mr. Williams as follows : 



"DEPARTMENT OF COMMERCE 

 "Bureau of Standards 



"Washington, September 25, 1915. 

 "West Virginia State Road Bureau, 



"Morgantown, W. Va. 

 "Gentlemen : 



"A report of the tests on the two samples of shale, marked Nos. 

 101 and 102, submitted by you to this laboratory, is as follows: 



"Sample No. 102 (Red Shale). The sample was ground, screened 

 through a 10-mesh sieve and tempered to stiff mud consistency by wedg- 

 ing on a marble slab. Briquettes 2%"xl 1 / 4"x%" were prepared by 

 passing the plastic clay through a piston plunger machine, having a 

 rectangular die. The briquettes were dried first at room temperatures 

 and finally in an electrical drying oven at 110 C. The linear drying 

 shrinkage was 3.5 per cent, and the water required to make it plastic 

 18.5 per cent. The shale has working plasticity favorable to manufac- 

 ture by the stiff mud process. 



