TABLE XXIV. THE TABLE GIVEN BELOW SHOWS THE SIZES OF VARIOUS WIRES OF DIFFERENT MATERIALS WHICH WILL FUSE AT THE CURRENTS GIVEN IN THE FIRST COLUMN (SIR W. H. PREECE). NOTE. The above numbers can only be taken as approximate, as the actual current required to fuse any gauge will depend on the length of fuse and cooling effects of the fuse block in which it is placed. Length of circumference of circle radius (?) = 2′′ = ñd. Area of circumference of circle radius (r) = πr2 Ratio of circumference of circle to its diam. == #d2 × 44.25 = = × 1980000 = = kilogrammeters per sec. ft. lbs. per min. kilogrammeters per sec. ft. lbs. = .7854d2. Base of hyperbolic or Napierian logarithms = 2.71828 To convert Napierian into Common logarithms multiply by 0.43429. To convert Common into Napierian logarithms multiply by 2.30258. Lbs. per yard of pure copper wire = area in sq. ins. x 11.5625. Ohms per yard of pure copper wire at 60° F. (15.5°C.) =0·0000244657 ÷ area in sq. ins. 10 0000 0443 0086 0128 0170 0212 0253 0294 0334 0374 4 11 0414 0453 0492 0531 0569 0607 0645 0682 0719 0755 4 12 0792 0820 0804 0899 0934 0969 1004 1038 1072 1106 3 13 1139 1173 1206 1239 1271 1303 1335 1367 1399 1430 3 14 1401 1492 1523 1553 1584 1614 1644 1673 1703 1732 3 15 1761 1790 1818 1847 1875 1903 1931 1959 1987 2014 3 16 2041 2068 2095 2122 2148 2175 2201 2227 2253 2279 3 8 12 17 21 25 8 11 15 19 23 4 6 3 26 4150 4166 4183 4200 4216 4232 4249 4265 4281 4298 2 3 27 4314 4330 4346 4362 4378 4393 4409 4425 4440 4456 2 3 28 4472 4487 4502 4518 4533 4548 4564 4579 4594 4609 2 3 29 4624 4639 4654 4669 4683 4698 4713 4728 4742 4757 1 3 30 4771 4786 4800 4814 4829 4843 4857 4871 4886 4900 1 31 4914 4928 4942 4955 4969 4983 4997 5011 5024 5038 1 32 5051 5065 5079 5092 5105 5119 5132 5145 5159 5172 1 33 5185 5198 5211 5224 5237 5250 5263 5276 5289 5302 1 34 5315 5328 5340 5353 5366 5378 5391 5403 5416 5428 1 35 5441 5453 5465 5478 5490 5502 5514 5527 5539 5551 1 29 33 37 26 30 34 24 28 31 23 26 29 22222 5 5 18 21 24 17 20 22 21 16 18 20 15 17 19 8 10 12 14 16 18 8 10 12 7 9 11 36 5563 5575 5587 5599 5611 5623 5635 5647 5658 5670 1 44444 3 2 3 3 3 3 22222 4444A 4 887700 77666 5 66666 5 5 5 6 46 6628 6637 6646 6656 6665 6675 6684 6693 6702 6712 1 2 53 3 4 3 4 3 3 4444 བ་ལབབ 99996 9999 5 6 5 6 8777 1 56 7482 7490 7497 7505 7513 7520 7528 7536 7543 7551 61 7853 7860 7868 7875 7882 7889 7896 7903 7910 7917 1 62 7924 7931 7938 7945 7952 7959 7966 7973 7980 7987 1 63 7993 8000 8007 8014 8021 8028 8035 8041 8048 8055 1 64 8062 8069 8075 8082 8089 8096 8102 8109 8116 8122 1 65 8129 8136 8142 8149 8156 8162 8169 8170 8182 8189 1 66 8195 8202 8209 8215 8222 8228 8235 8241 8248 8254 1 22 3 4 5 5 6 7 22 3 5 5 6 7 1 22 3 45 5 6 7 1 2 3 44 5 6 4 5 4 5 6 6 12 3 4 4 34 71 8513 8519 8525 8531 8537 8543 8549 8555 8561 8567 1 72 8573 8579 8585 8591 8597 8603 8609 8615 8621 8627 1 73 8633 8639 8645 8651 8657 8663 8669 8675 8681 8686 1 74 8692 8698 8704 8710 8716 8722 8727 8733 8739 8745 1 75 8751 8756 8762 8768 8774 8779 8785 8791 8797 8802 76 8808 8814 8820 8825 8831 8837 8842 8848 8854 8859 1 81 9085 9090 9096 9101 9106 9112 9117 9122 9128 9133 86 9345 9350 9355 9360 9365 9370 9375 93809385 9390 1 i 1 2 12 2 44444 44448 4444+ 6 1 2 2 3 3 4 91 9590 9595 9600 9605 9609 9614 9619 9624 9628 96330 96 9823 9827 9832 9836 9841 9845 9850 9854 9859 9863 0 1 1 97 9868 9872 9877 9881 9886 9890 9894 9899 9903 9908 0 11 98 9912 9917 9921 9926 9930 9934 9939 9943 9948 9952 0 11 99 9956 9961 9965 9969 9974 9978 9983 9987 9991 9996 0 1 1 |