568 
Philippine Journal of Science 
1919 
The results in Table I show that the true sectional area of 
the ropes tested varies from 62 to 100 per cent of the calculated 
area, the mean being 86 per cent. For small ropes, this mean 
percentage of the calculated area will give a fairly accurate 
approximation of the true sectional area. 
Table I . — Relationship between the mean calculated and the true mean 
area of the ropes tested. 
ROPES MADE OF BAST FIBERS. 
Fiber. 
Calcu- 
lated 
area. 
True 
mean 
area. 
True 
mean 
area-t- 
calcu- 
iated 
area. 
sq. mm. 
sq. mm. 
Abroma fastuosa: rope made of crude bast strips 
103.9 
88.4 
0.86 
Ahroma fastuosa; rope made of retted bast - 
28.7 
24.4 
0.85 
Commersonia hartramia 
116.0 
97.6 
0. 86 
Helicteres hirsuta 
97.3 
78.6 
0.81 
Kleinhovia hospita,.. 
120.8 
116.6 
0.96 
Pteroeymbium tinctorium 
140.7 
114.0 
0.81 
Pterospermum diversifolium 
36.1 
28.8 
0.82 
Sterculia crassiramea 
126.7 
121.3 
0. 96 
Sterculia foetida. ... . 
38.6 
28.4 
0.73 
Sterculia oblongata 
116.0 
96.0 
0.83 
Sterculia siipularis forma 
38.6 
29.5 
0.76 
Bombycidendron vidalianum 
38.6 
31.6 
0.82 
Malachra fasciata 
23.1 
21.2 
0.92 
Sida acuta . 
45.8 
40.8 
0. 89 
71.6 
57.8 
0.81 
Urena lohata 
35.1 
30.3 
0.87 
Columbia blancoi 
147.4 
116.2 
0.78 
Corchorus olitorius 
38.5 
32.8 
0. 86 
Grewia eriocarpa 
31.9 
25.9 
0.82 
Grewia multiflora 
45.8 
38.8 
0.85 
Gi'ewia bilameUata 
103.9 
85.4 
0.82 
Allaeanthus glaber 
120.8 
100.2 
0. 83 
Artocarpus communis 
28.7 
28.4 
0.99 
Ficus benjamina 
42.0 
32.5 
0. 77 
Ficus forstenii . . 
38.6 
38.8 
1.00 
Ficus pachyphylla 
38.5 
32.3 
0. 84 
Ficitspalawanensis..^ 
28.7 
20.6 
0.72 
Cordia cumingiana - 
115.0 
86.8 
0. 76 
49.7 
44.5 
0. 90 
25.5 
21.6 
0. 84 
54.1 
43.0 
0.80 
Trema orientalis. — 
54.1 
46.6 
0. 86 
Goniothalamus amuyon 
66.5 
40.9 
0.62 
0. 84 

