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. 
True 
mean 
Fiber. Saved ies pot mc 
area. area, lated 
area, 
sq.mm. 8q.mm. 
Abroma fastuosa; rope made of crude bast strips ------------------ 103.9 88.4 0. 85 
Abroma fastuosa; rope made of retted bast .--.--------------------- 28.7 24,4 0.85 
Donemereonta bartramin. 22. vi... socks eee nd cn aee se eee 115.0 97.5 0.85 
Pt dlisteven Mepeute oe oe secs See ees 97.3 78.6 0.81 
Rieinhovia hoepite 25300 Ss. sores tess oi see eesees sees 120.8 116.6 0.96 
Pterocymbium tinctoriwm .........-.------.------------------------ 140.7 114.0 0.81 
Pterospermum diversifolium ee Se eee $5.1 28.8 0. 82 
Siavauiut Griese 3 a a es ee ee 126.7 121.3 0.96 
Sterduled loeb 2 ck ec eee es $8.5 28.4 0.73 
Sterculia oblongat oe eg eee es 115.0 96.0 0.83 
Stereulia steguiaris forma 6.52 Se 5s eee eae eno 38.5 29.5 0. 76 
Bombycidendron vidalianum.._....------------- Be eee es 88.5 $1.6 0. 82 
MAGUGRV ATURE Oot os Se a a bo a eee 23.1 21.2 0.92 
Mile Sie Rea ess Shoe 45.8| 40.8| 0.89 
Whasinanss Tae ns hese 71.6 57.8 0.81 
Pieeha oan ee ee 35.1 30.3 0. 87 
Coliabia Cant ae ee 147.4 115.2 0.78 
Corchorus olitorius pee ae ee 38.5 $2.8 0.85 
Grew it 6FIOCUPDG oe oo a a Sec occ one 81.9 25.9 0. 82 
GCroitta Weulttherd a Se 45.8 38.8 0. 85 
Growia bilamellahl 5 Se a 1038.9 85.4 0.82 
Allacaithus glaber ss Scossice occ oh SR as a wee 120.8 100.2 0. 83 
Artocarpus COMVMWNLE 3.55 356 ees oa sa sewacn ccd bcks- sass cect 28.7 28.4 0. 99 
Ficus besjandna 2S ee 42.0 $2.5 0.77 
Pious jorstentt. oo. coc cs RO ee as ee 38.5 38.8 1.00 
Ficus pachynhella os -ss0cncwciaulvciumich ec tosecca wi aware. san 88.5 82.8 0. 84 
Ficus palawanensis..... 2 a 28.7 20.5 0.72 
Pordis Guminpiand ee 115.0 86.8 0. 76 
Cordia gua 2. a ae a ee ee 49.7 44.5 0. 90 
Grrcatnete se pews in ky cue 8 quae buc twa tie ee own net 25.5 21.5 0. 84 
opines edtbe ee ee 54.1 43.0 0. 80 
Tenn oriettdhe. ee 54.1 46.6 0. 86 
Gonsothalanuis dmugin 2 oe Se 66.5 40.9 0. 62 
= Average ...255 7. eS. ide ee ee ne greet Sees 0.84 
