572 Philippine Journal of Science 1919 
TABLE Il.—Twist of the ropes tested and the relationship of girth to 
twist—Continued. 
ROPES MADE OF MISCELLANEOUS FIBERS. 
| | 
: | is Length Twist | 
Fiber. | Girth. Pao rs girth. | 
eee | Seas see Bes 
; | mm. mm. 
Mie eee ce PC bes en 31 30 0.97 
sh habe OSS Se Reale Wis eae Co ae at cern ang Rerene Geeuenenore Bees Were a 15 13 0.87 
Disa tert: peace. G fibere.. cs c500 5s oe 26 25 0. 96 
RG a a he ade tenaeeenae 16 15 0.94 
Commercial unclassified fiber.) 2) oto es ee 45 45 1.00 
Boe Ss. oak Said s CEE ees Sd Se ca eens 24 25 1.04 
Agave cantala; maguey Cebu No. 24 _..-------- Be ar 26 21.5 0. 88 
Agave cantala; maguey from Santo Domingo, Locos Sur --.--------- 23 17 0. 74 
Agave cantala; maguey from Sulvec, Ilocos Sur -------------------- 25 21 0.84 | 
Cocos nucifera; salt-water retted, from Caoayan, Ilocos Sur ------- 50 38 0.76 
Cocos nucifera; machine cleaned, from Laguna husks -..-.-------- 44 87 0.84 | 
Fig se ae eguuocws macene susan 24 20 0.83 | 
orale: elata: leat oo i i te ccc ks 47 40 0.85 | 
Corypha elata; vascular fiber from petioles; buntal ~--_------------ 22 20 0.91 | 
A ON SELES SAE Sees nace eee ce rile 20 18 0.90 | 
Anamirta cocculus; entire stem of vine twisted into a three-strand } 
Ne 44 40 0.91 | 
Dendrocalamus merrillianus> ..........---------------------------- 46 $1 0. 67 | 
Aveda 2.555. a eS SS ee 0. st | 
& Machine-made rope; all other ropes are handmade. 
» Two-strand rope; all other ropes have three strands. 
resistant rope test specimens. This machine is of the lever 
type in which the test piece is held in a vertical position. The 
beam is graduated in 1,000- and the dial in 5-pound intervals. 
For testing the smaller ropes, a Riehlé testing machine of the 
helical spring-scale type was used. This machine is hand ope- 
rated, by means of a flywheel having 4 crank, and has a capa- 
city of 600 pounds. The dial is graduated in 1-pound intervals. 
Tensile-strength tests——The test specimens were prepared 
with an eye-splice at each end, the eyes having an internal 
diameter of 4.5 centimeters, and the splices having three tucks. 
The clear length of rope between the splices was either 50 or 
100 centimeters, with 3 or 4 centimeters extra for marking. 
Upon this clear length of the test specimen the gauge length 
used for determining the elongation was laid off. Except as 
indicated, five test specimens were broken to give each average 
result. Plate II, fig. 2, represents typical test specimens. 
One series of experiments was conducted upon test pieces 
in an air-dry condition. The results obtained from these spe- 
cimens are designated throughout this paper as dry tests. Table 
