Bisbee daily review., 1915-03-14

to do SO under an unusual pressure from the resulting gases. in order ito force them through the constricted opening and this pressure was su- .nicient Co rupture the walls of the fuse as soon as it was unsupported by the vise In No ' and 8 this pressure eXerted itself in forcing the fire through the remaining half inch of fuse and thereby increased the |str4ngth of the flash Experiments 9 and 10 showed that the explosive force of the burning powder was ueately decreased when the fuse was under pressure. although as seen iu No. 6. the rate of burning was not affected When the fuse was under pressure to its extreme end. and the the flash was very weak. Expert ments z, B. and n showed that i5 in of ncompressod fuse lying be- yond the area of pressure was su- nicient Co insure a strong flash
 or the experiments with caps. No '13. 14. l5. 20. and % showed perfect results m au cases where the end of the fuse was cut square and placed in loose contact with the illuminate. even when the crimpiue was uu- . necessarily severe It is noteworthy that no experiment was made with the fuse in coutact with the fulmi- ! iuate and the cap crmped Co the tip Of the fuse as this would have n- - volyed danger Of accidental eXpio- sion Of the ulmmate In the crimp- ing process.
 Mo- l6 and IS gave perfect results with the end of the fuse |, and ia ir. from the illuminate. although it is conceivable that with weak fuse misdres might occur from this prac- tice if it were followed reguarly.
 No ll7. considered in connection n with No. 9 and 70. indicates the pos - sibility of misfres that can easily occur iu practice and one that would 5 hardly be suspected without a spe- cial inyestigaton The experiments show that pressure at the tip Of the o fuse especially if t be applied sey- , eral times and from dinrent direc- t tions SO as Go roll or crush the fuse . and disarrauge the powder train de- . Cidedly Weakeus the flash to such an extent that when the end Of the fuse - was 4 in. from the illuminate 1t caused nine misdres out of 20 Tn contrast Go this. with moderate crimp V ing. all of 20 trials were successful y when the end Of the fuse was F. m
 rom the illuminate. The incident of careless crimpng that ! mentioned n with its four mishres out of IS loaded ~ holes. was doubtless of this nature and was due Co crushing and crimp
 ing the fuse at it's tip. as shown by an investigation of the single cap , recovered after soaking it in water ' Consideration of caution prevented me from carrying my investigation Cd the extent that my eX-employee did
 Experiment 1s failed 70 produce any misdges. although the practice y of cutting the fuse with a long slam r Ns commonly regarded as cause o
 mishres and cannot be recommended
 The experiment was made in col. W weather Probably if tho fuse wer, !. warm, the slantng end would show
 greater tendency To curl over wine. " pressed against the illuminate and
 thus prevent the flash from sribn.
 the illuminate It is also probaaI
 that the chance of misfres from har. le crimpug would be increased wiz
 warm fuse because if would then b, ,. softer and more easily crushed. -- Experiment 21 was made to tes the possibility ol misdre being cause, of by the condemnation Of moisture i,
 the flash leNperimeHu2) on the col,
 illuminate SO as to prevent its eH
 plOsion. but the result was negative ms realize that to make experiment. 10 of this kind conclusive as to the pro
 portion of missed holes caused bl w the different methods of attachin Ithe cap to the fuse. it would Dc ne |coesary sreately to increase no, number of tests. but. as ! started b. fcre. my object was rather to tes ok the conclusions formed by o5aer,a ay tons made under working condalon-
 and incidentally to learn anytn.u
 new that might come up. and th. . number of tual- were suriu ?, to
 this purpose A | hoped thc show
 up |iIN '.H'. " JUL I'a'tf .....'...
 .cauld be caused by a slight uro ton from the commonly approys
 method of attaching fuse and cap 'n Summary of Conclusions.
 To summarize my conclus ions.
 would make the foHowins recon .meudau0ns.
 ga l. Cut Che fuse square with al instrument that does not mash th end such as a sharp knife. a pair O
 sheep shears. or, best ol all, pro .
 thlu sharp chisel used with ma
 Iet
 9. Insert the fuse into the ca
 until the end is in loose contact wit
 the illuminate
 g.. Use the California crimpe
 lbroad typc) giving the cap on
 nm squeeze close 10 the open end
 If working where there is water
 the holes protect the cap from damI
 ness by applying grease or tar laf I. Particularly avoid crimpn ng the cap over the tip of the fuse A
 ways leaveil to ia in. of uncrimpe .dy fuse at the end