We then find, page 576, the following statement: “Ingenious as Prof. Wheatstone’s, contrivances are, they would have been of no avail for telegraphic purposes, without the investigation which he was the first to make of the laws of electro magnets, when acted on through great lengths of wire. _Electro magnets of the greatest power, even when the most energetic batteries are employed, utterly cease to act when they are connected by considerable lengths of wire with the battery._” If any thing were needed to show that Prof. Wheatstone was not the inventor of the _Electro Magnetic Telegraph_, it is this assertion (under the supervision of Prof. Wheatstone) made by Prof. Daniel. In 1843, Prof. Wheatstone had not made the discovery upon which Prof. Morse bases his invention, viz. that _Electro Magnets can be made to act, with an inconsiderable battery too, when the latter is connected with the former by considerable lengths of wire_: 80 miles may certainly be considered as of _considerable length_. [Illustration: FIG. 25.] _Table constructed from the Curve._ Battery alone 5.20 inches. 1 mile 3.85 “ 2 “ 2.62 “ 3 “ 1.84 “ 4 “ 1.20 “ 5 “ 1.05 “ 6 “ .92 “ 7 “ .80 “ 8 “ .71 “ 9 “ .64 “ 10 “ .57 “ 20 “ .30 “ 30 “ .20 “ 40 “ .14 “ 50 “ .094 “ During the previous summer, I made the following experiments, upon a line of 33 miles, of number 17 copper wire, with a battery of 50 pairs. In this case, I used a small steelyard, with weights, with which I was enabled to weigh, with a good degree of accuracy, the greater magnetic forces, but not the lesser, yet sufficiently approximating the recent results to confirm the law in question. _Table of Results._ 50 pairs through 2 miles attracted and raised 9 ozs. “ 4 “ “ “ 4 “ “ 6 “ “ “ 3 “ “ 8 “ “ “ 2½ “ “ 10 “ “ “ 2¼ “ “ 12 “ “ “ ⅛ “ “ 14 “ “ “ ⅛ “ and each successive addition of two miles, up to 33, still gave an attractive and lifting power of one-eighth of an ounce. _Curve from these Results._ [Illustration: FIG. 26.