858 REPORT—1885. 
Taste III.—The Calculated Strength of Round Poles one foot long. 
Diameter meters | Breaking weight in lbs. || Diameter meters | Breaking weight in lbs. 
6 13,776 10 63,773 
6°25 15,568 10°25 68,678 
6°5 17,517 10°5 73,819 
675 19,611 10°75 79,218 
7 21,873 11 84,874 
7°25 24,304 11:25 90,798 
75 26,902 115 96,992 
775 29,725 11°75 103,454 
8 32,648 12 110,196 
8°25 35,807 12°25 117,219 
8:5 39,166 12°5 124,555 
8°75 42,716 12°75 132,182 
9 46,491 13 140,100 
9°25 50,467 13°25 148,344 
9°5 54,678 13°5 156,901 
9°75 59,102 13°75 165,782 
To obtain the strength of any pole divide the tabulated breaking weight by the length of 
the pole in feet between the ground line and the resultant point of the load. 
Taste LV.— Wind Presswre, 18°75 per sq. ft.—factor of safety of 4; Strains 
and Strength of 17 wire line; 60 yards spans; calculated to constants 
obtained at Gloucester Road. 
No. 8 Wire No. 14 Copper 
Length of | eee Re ie) 
Pole Moment of Safe Moment of Safe | ie ne 2 
Pressure in lbs. | diameter || Pressure in Ibs. | diameter | 
26 8,344:0 8:25 3,953°6 6:0 | 8°25 
28 9,374°4 8:5 4446-4 6°5 | 8°75 
30 9,811:2 8:5 4,648-0 675 | 9:0 
32 10,796°8 8:75 5,118°4 70 | 9°25 
34 11,771°2 9°25 5,577°6 725 | 9°75 
36 12,264-0 9:25 5,790°4 Tbe | akOO 
40 14,224-0 9°75 6,742°4 T5 10°75 
Taste V.—Wind Pressure, 18°75 per sq. ft—Strains and Strength of 20 
wire line: 60 yards span: calculated on constants obtained at Gloucester 
Road. 
No. 8 Wire ! No. 14 Copper 
SNC ae > Specification 
Pole Moment of Safe | Moment of Safe diameter 
Pressure in lbs. | diameter || Pressure in lbs. | diameter 
26 9,811:2 8:5 | 3,953°6 (35) 8:25 
28 10,964°8 9:0 / 5,196°8 8-0 8°75 
30 11,547:2 9-0 } 5,465°6 8-0 90 
32 12,700°8 9:25 | 6,014°4 8:5 9°25 
34 13,8544 95 - || 6,663-2 8:5 9°75 
36 15,545°6 10:0 7,369°6 9-0 10:0 
40 16,732°8 10°25 | 7,907°2 9°5 10°75 
