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261
May 26th 1842
Induction from galvanism

Prepared a battery of 10 elements, the battery of quart mugs. Connected this battery with the rectangle on the inside of the electrical case - Next charged the several spirals of one set with needles and connected this with the secondary conductor. The wires being near together, all the needles came out magnetic when the contact was made, the one in the more compound the stronger - When the needles were replaced and the contact broken, all the needles except that in the first spiral came out neutral. The action at the ending just neutralized that at the [[strikethrough]] ending [[/strikethrough]] beginning, except in the case of the first needle, this at first was perhaps magnetized to near saturation, and consequently [[strikethrough]] the same magn [[/strikethrough]] ^[[an equal action]] would  more than discharge the magnetism.
  The induction with this arrangement is quite feeble, probably the effect would be much greater if a ribbon wire used instead of the thin wire.
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  Next the same spirals were charged with needles, and then the contact was made and broken with the battery several times in succession - The needles at the end of the operation came out electrified +, or as if by the ending induction.

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A part of this afternoon was occupied in distilling mercury for the use of the photographic art -- The mercury was placed in an [[image]] iron bottle, and this placed in the [[pager ?]]. A gun barrel attached at one end to the bottle dipped into water in a wide mouth phial, and this was placed in a wash basin filled with water. The mouth of the phial with a wet towel, and a part of the same was wrapped around the [[?]]
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262
May 27th - 1842
[[underlined]] Magnetizing spiral [[/underlined]] common electricity

[[notation in left margin beside section to follow]] 1 [[/notation in left margin]]
Placed needle in the axis of the spiral described, bottom page 253 - Sent [[strikethrough]]dis[[/strikethrough]]charge through the spiral from 3 jars, needle magnetic in the [[underlined]] plus [[/underlined]] direction - Next placed a similar needle in a lead tube of about 1/4 of an inch of external diameter, and 1/20 of an inch thick of metal. The needle with a charge equal in quantity no polarity - The quantity of the charge was next varied, but in no case could I magnetize the needle while it remained in the tube.

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[[notation in left margin beside section to follow]] 2 [[/notation in left margin]]
  Next the tube was cut open along [[strikethrough]] its axis [[/strikethrough]] a line on its side parallel to its axis. The needle was now as strongly magnetic as if the [[strikethrough]] wire [[/strikethrough]] metal was not present. The two edges of the opening were next purchased together so as to be in contact, but with this I could not succeed in screening, or rather in neutralizing the magnetism.

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[[notation in left margin beside section to follow]] 3 [[/notation in left margin]]
[[image in left margin]]  Next placed a small magnetizing spiral of thin wire with the other one - With the ends open - The needles was strongly magnetized. Nex closed the ends of the spiral, now the needle same out very slightly plus; and one not at all magnetized.

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[[notation in left margin beside section to follow]] 4 [[/notation in left margin]]
[[sideways notation in left margin beside section to follow]] important exp [[/sideways notation]]
The spiral used in the last exp was a single one - substituted for this a compound one. The needle placed in this in the first attempt was also magnetized slightly [[underlined]] plus [[/underlined]] ^[[when the ends were closed]]. I then introduced into the circuit a tube of water, so as to pass the charge through about one inch of water. The needle now came out of the inner spiral magnetized - [[underlined]] minus [[/underlined]]. This was repeated 6 or 8 times with the same result.

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This arrangement was made in order to prevent the regurgitation of the water, and the blowing out of the mercury with the steam. Only about one half of the mouth of the barrel was plunged under the surface of the water in [[image]] the phial, so as to let the air in to restore the equilibrium.