629
STRENGTH OF GLASS.
WIRES PLATE, LEHR ANNEALED. 24-INCII SPAN.
Factory.	Description.	Nominal thick- ness.	Dimensions.		Ultimate strength.		Deflec- tion.
			Width.	Thick- ness.	Total.	Modulus of rupture per square inch.	
Appert	 Mississippi	 Appert	 Mississippi	 Appert		Sandwich rolled.. Solid rolled	 Sandwich rolled.. Solid rolled	 Sandwich rolled.. 	do		Inch. I ! i	Inches. 8.00 7.96 7.95 8.00 7.95 8.00	Inches. .28 .29 .37 .35 .54 .56	Pounds. 88 90 137 101 301 288	Pounds. 5,050 4,840 4,530 3,710 4,670 4,130	Inch. .15 .15 .10 .10 .08 .07
WIRED PLATE, LEHR ANNEALED. 16-INCH SPAN.
Appert		Sandwich rolled..	!	8.00	.30	126	4,200	.04
		X	7.99	.32	125	3,670	.05
Appert V.		Sandwich rollôd..	i	8.00	.40	225	4; 220	.05
		1	7. 95	.40	192	3,620	.04
Appert 			Sandwich rolled..		7.98	.55	386	3^ 840	.03
		do		è	7.99	.53	375	4,010	.03
WIRED PLATE, LEHR ANNEALED. 8-INCH SPAN.
		!	8.00	.26	247	5,480	
		x	7.99	.31	192	3,000	
		1	7.96	.38	468	4,880	
		!	7.99	.39	469	4,630	
			8.00	.54	717	3,690	
		do		5	8.00	.55	890	4; 410	
Transverse Tests.
Lights supported at the ends, loaded at the middle. Comparison of strength of glass from different factories.
ROUGH PLATE. 24-INCH SPAN.
Nominal thick-	Modulus of rupture per square inch.			The stronger glass.
	Appert.	Mississippi.	Mean.	
£ inch		Pounds. 5,890	Pounds. 7,820	Pounds. 6,855	!Mississippi.
inch		6,640	5,260	5,950	Appert.
1 inch		7,410	6,310	6,860	Do.
|inch 		4,770	5,870	5,320	Mississippi. 1
-h inch		5,160	4,240	4,700	
1 inch		4,890	(>, 030	5,460	> Factory not known.
1 inch		4,020	3,750	3,885	
RIBBED PLATE. 24-INCH SPAN.
Thickness.	Modulus of rupture per square inch.		The stronger glass.
	Appert factory.	Mississippi factory.	
	Pounds. 4,790 6,850 5,150	Pounds. 5,630 6,890 5,250	Mississippi. No practical difference. Very little difference.