STRENGTH. OF GLASS.
RIBBED PLATE. IB-INCH SPAN.
628
Factory.	Description.	Nominal thick- ness.	Dimensions.		Ultimate strength		
			Width. _ *.	Thick- ness.	Total.	Modulus of rupture per square inch.	Deflec- tion.
Appert	 Mississippi	 Appert	 Mississippi	 Appert	 Mississippi		Lehr annealed ... 	do	 	do	 	do	 	do		Inch. 8 i S	Inches. 8.00 7.99 8.00 7.95 7.99 ! 7.97	Inches. .15 .15 .27 .27 .38 . 36	Pounds. 42 39 132 121 289 230	Pounds. 5,600 5,210 5,430 5.010 6.010 5,340	Inch. .15 .16 .08 .07 .07 .06
RIBBED PLATE. 8-INCH SPAN.
!	8.00	.29	331	5,900	
1	8.00	.28	283	5,410	
1	8.00	.39	448	4,420	
i	7.97	.37	645	7,100	
Lehr annealed ...
___do...........
...do...........
...do..........
Appert------
Mississippi .
Appert------
Mississippi
POLISHED PLATE. 24-INCH SPAN.
■-׳־	8.03	.09	11	6,090	.45
5	8.00	.12	26	8,120	.42
	7.98	.17	43	6,710	.24
	8.03	.18	49	6,780	.30
	8.09	.24	72	5,560	.20
Î	8.01	.25	56	4,030	.14
	8.01	.50	313	5,630	.10
a	8.01	.50	280	5,040	.09
1	8.05	.75	809	6,440	.08
	8.02	.73	745	6,280	.08
1	8.00	1.01	972	4,290	.04
1	8.02	.99	1,072	4,910	.05
Lehr annealed . Oven annealed. Lehr annealed . Oven annealed. Lehr annealed . Oven annealed.
....do.........
....do.........
....do.........
....do.........
.....do........
....do.........
Pittsburg. Toledo ... Toledo ... Pittsburg. Pittsburg. Pittsburg.
POLISHED PLATE. 16-INCH SPAN.
	8.04	.09	19	7,000	.21
	8.05	.13	41	7,240	.20
	8.05	.17	70	7,220	.17
	8.00	.17	70	7,270	.15
	8.05	.21	89	6,020	.10
!	8.02	.24	106	5,510	.09
1	8,02 8.02	.45	286	4,240	.06
		.45	379	5,600	.05
	8.02	.76	855	4,430	.03
	8.03	.75	1,081	5,740	.03
	8.05 8.00	.96 .98	820 1,510	2, 650 4,720	
Lehr annealed Oven annealed Lehr annealed Oven annealed Lehr annealed Oven annealed Lehr annealed Oven annealed
....do....
....do....
....do....
....do....
Pittsburg.
POLISHED PLATE. 8-INCH SPAN.
.09	30	5,530	
.15	80	5,310	
.22	195	6,040	
.25	217	5,200	
.50	825	4,940	
.49	904	5,630	
.73	1,320	3,700	
.73	2,310	6,480	
1.05	2,420	3,290	
1.03	4,580	6,500	
8.04
8.04 8.00 8.02 8.01
8.03
8.03
8.03
8.03 7.98
Lehr annealed... Oven annealed.. Lehr annealed... Oven annealed .
....do.........
....do.........
Lehr annealed.
....do.........
....do.........
....do.........
Pittsburg .
Toledo----
Pittsburg.