592 Philippine Journal of Science 1919 
TABLE XII.—Physical tests of rope made from the bast of Pterospermum 
diversif olium—Continued. 
Mean ultimate tensile strength per unit area (dry): 
Kilograms per square centimeter 263 
Pounds per square inch 3,740 
Mean ultimate tensile strength per unit area (wet): 
Kilograms per square centimeter 261 
Pounds per square inch 3,690 
Mean elongation at instant of rupture: 
Dry (per cent) ii 
Wet (per cent) 15 
Mean weight per unit length: 
Grams per meter 28.9 
Pounds per foot 0.0194 
Average breaking length: 
Meters 2,620 
Feet 8,620 
Moisture (per cent) 9.68 
PTEROCYMBIUM TINCTORIUM (Blanco) Merr. Taluto. 
Local names: Abigon, tadto, tavitu (Bataan, Leyte); abigén (Bataan) ; 
balulau (Agusan); bangat (Zambales); bayau, takung (Surigao) ; duidui 
or duyduy (Tayabas); huligano (Nueva Ecija); libtuék (Cagayan Prov- 
ince); malasapsép (Pampanga); marakapas (Ilocano); tagung-tungan 
(Cebu) ; takong (Surigao) ; taléto or talito (Bataan, Camarines, Cotabato, 
Laguna, Mindoro, Negros, Nueva Ecija, Palawan, Tayabas). 
A deciduous tree with broadly ovate, often lobed leaves; 
flowers appearing with or before the new leaves; fruit with 
a long boat-shaped appendage; throughout the Philippines at 
low and medium altitudes. 
Pterocymbium tinctorium bast is pale yellow-orange. Each 
strand of the rope averages nine ribbons thick, and these vary 
in thickness from 0.28 to 0.89 millimeter and have a mean length 
of 1,889 millimeters. Dry rope made of this bast is low in 
tensile strength and breaking length. Immersion in water for 
twenty-four hours increased the tenacity of the fiber about 7 
per cent. Wetting also caused the test specimens to break more 
uniformly. The maximum variation from the mean in the wet 
series of five tests was 18 per cent, whereas the corresponding 
value for the five dry specimens was 26 per cent, None of the 
test pieces saturated with water failed in eye-splices, but three 
out of the five dry specimens ruptured therein. One of the 
three specimens that ruptured in an eye-splice gave the maxi- 
mum result. 
A summary of the tests made in the Bureau of Science is 
given in Table XIII. 
