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It will be seen that there are two electromagnets, one of which, TM, is known as the "type-magnet," and the other, PM, as the "press-magnet," the former having to do with the operation of the type-wheels, and the latter with the pressing of the paper tape against them.
During this half revolution the segmental wheels have also been turning, and the brushes have transmitted a number of current impulses to TM, which have caused it to operate the escapement a corresponding number of times, thus turning the type-wheels around to the letter M. When the cylinder stops, current once more goes to the press-magnet, and the operation of lifting and printing is repeated.
Accordingly, we shall recognise the same forms under other names; but at each return more specific and intense; and the whole process repeated with ascending gradations of reality, exempli gratiâ: Time + space = motion; Tm + space = line + breadth = depth; depth + motion = force; Lf + Bf = Df; LDf + BDf = attraction + repulsion = gravitation; and so on, even till they pass into outward phenomena, and form the intermediate link between productive powers and fixed products in light, heat, and electricity.
During the rotation of the cylinder a current would pass through wheel W' and actuate TM, drawing down the armature and operating the escapement, which would bring the type-wheel to a point where the letter A would be central as regards the paper tape When the cylinder came to rest, current would flow through the brush of wheel W to PM, and its armature would be attracted, causing the platen to be lifted and thus bringing the paper tape in contact with the type-wheel and printing the letter A. The operator next sends the letter M by depressing the appropriate key.
I am sure they would be glad, if it should be, found practicable, to make that discrimination between Great Britain and Ireland, which their commercial principles, and their affection for the latter, would dictate. I have the honor to be, with the highest respect for yourself and the company for whom you write, Sir, your most obedient and most humble servant, Tm: Jefferson.
It should be borne in mind, however, that the contact surfaces and insulated surfaces on wheel W' are together equal in number to the characters on the type-wheels, but the retractile spring of TM does half the work of operating the escapement.
A most favorable reduction of duties on whale-oil has taken place here, which will give us a vent for that article, paying a duty of a guinea and a half a ton only. I have the honor to be, with the highest esteem and respect, Dear Sir, your most obedient and most humble servant, Tm: Jefferson. LETTER CXLIX. TO A. CARY, January 7, 1786 Paris, January 7, 1786. Dear Sir,
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