| No. of Wire Gauge. | American (B. and S.) Wire Gauge. | Birmingham Wire Gauge. |
| 0000 | .46 | .454 |
| 000 | .40964 | .425 |
| 00 | .3648 | .38 |
| 0 | .32486 | .34 |
| 1 | .2893 | .3 |
| 2 | .25763 | .284 |
| 3 | .22942 | .259 |
| 4 | .20431 | .238 |
| 5 | .18194 | .22 |
| 6 | .16202 | .203 |
| 7 | .14428 | .18 |
| 8 | .12849 | .165 |
| 9 | .11443 | .148 |
| 10 | .10189 | .134 |
| 11 | .090742 | .12 |
| 12 | .080808 | .109 |
| 13 | .071961 | .095 |
| 14 | .064084 | .083 |
| 15 | .057068 | .072 |
| 16 | .05082 | .065 |
| 17 | .045257 | .058 |
| 18 | .040303 | .049 |
| 19 | .03589 | .042 |
| 20 | .031961 | .035 |
| 21 | .028468 | .032 |
| 22 | .025347 | .028 |
| 23 | .022571 | .025 |
| 24 | .0201 | .022 |
| 25 | .0179 | .02 |
| 26 | .01594 | .018 |
| 27 | .014195 | .016 |
| 28 | .012641 | .014 |
| 29 | .011257 | .013 |
| 30 | .010025 | .012 |
| 31 | .008928 | .01 |
| 32 | .00795 | .009 |
| 33 | .00708 | .008 |
| 34 | .006304 | .007 |
| 35 | .005614 | .005 |
| 36 | .005 | .004 |
| 37 | .004453 | |
| 38 | .003965 | |
| 39 | .003531 | |
| 40 | .003114 |
LIST OF APPARATUS
FOR
The Study of Elementary Electricity and Magnetism by Experiment.
The 100 pieces of apparatus in the following list are referred to, by number, in the experiments contained in "The Study of Elementary Electricity and Magnetism by Experiment." This list is furnished to give those who wish to make their own apparatus an idea of the approximate size, etc., of the various articles used. The author is preparing a price catalogue of the articles included in this list, and of odds and ends needed in the construction of simple, home-made apparatus.
No. 1. A package of 25 steel sewing-needles. To be suitable for experiments in magnetism, these should be of good, hard steel, and not too thick.
No. 2. A flat cork, about 1 in. in diameter and ⅜ in. thick.
No. 3. A candle for annealing steel.
No. 4–15. One dozen assorted annealed iron wires, from 1 in. to 6 in. in length. The iron should be very soft.
No. 16. One English horseshoe magnet, 2½ in. long, best quality.