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72
Tuesday Oct 17th 1843 [[vertical squiggly line]] Induction at a distance Long waves across the campus

Attached to the secondary current [[described?]] yesterday, one of the sets of spirals of different convolutions, and also the compound spiral used yesterday.

The following was the result:

1st  With one jar highly charged
[[following text enclosed in a box]]
* Spirals  NO A  NO 1  NO 2  NO 3   NO 4
Dynamic [[defl?]] -22 -12 1/2 -17    -5 -3
[[/end box]]

2nd       One jar
[[following text enclosed in a box]]
 Spirals   NO A   NO 1  NO 2  NO 3   NO 4
Dynamic [[defl?]] -20 -3 -15  -3    +1
[[/end box]]

3rd       One jar
[[following text enclosed in a box]]
 Spirals   NO A   NO 1  NO 2  NO 3   NO 4
Deflec      -20    -10   -18  -3 
 -1
[[/end box]]

4th     One jar   2 sets of spirals
     (Stronger charged loud snap
[[following text enclosed in a box]]
Spirals 1st set   NO A  NO 1   NO 2  NO 3   NO 4
Defl [[underline]] -45  -45   -40   -20     -4 [[/underline]]
           
Spirals 2nd set  NO A   NO 1   NO 2  NO 3   NO 4
Defl                     -45   -38   -23     -2
[[/end box]]

5th
[[following text enclosed in a box]]               
Spirals 1st set   NO A   NO 1  NO 2  NO 3   NO 4
Def               -25    -12   -18   -4      -0

Spirals 2nd set   NO A   NO 1  NO 2  NO 3   NO 4
Defl                     -17   -12   -4      -0
[[/end box]]
[[underline]] NB [[/underline]] All the results give an induced current opposite to that of the battery
* I have designated by NO [[underline]] A [[/underline]] the spiral used yesterday and also last Oct
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[[start page]]
Tuesday Oct 17th 1843 [[vertical squiggly line]]             73
Induction at a distance  Long wires across the campus      

1st       2 jars
[[following text enclosed in a box]]
 Spirals  NO A   NO 1   NO 2  NO 3   NO 4
Defl.     -20    -3     -7   -11     -0
[[/end box]]


2nd       2 jars
[[following text enclosed in a box]]
 Spirals  NO A   NO 1  NO 2  NO 3   NO 4
Deflec.   -20    -20    -3  -12     -2
[[/end box]]
[[image = diagram of suspended conductor]]
Suspended large conductor
       one spark
With this arrangement the needles came out magnetized - (Weather changed more damp)
[[centered horizontal line]]
Next used Dr Franklin's battery of 24 jars - charge 100 units
Air to damp for the jars without warming to release the charge.

Wednesday Oct 18th 1843
Attached two wires across the campus from Phil Hall to library.  Return of one through the wells of the President and Vise President, the other (the discharging wire), through the other two wells.
[[Image to the left of text - Diagram showing placement of the wires between the wells]]
Wires at first about 18 inches apart.

           One jar
[[following text enclosed in a box]]
Spirals   NO A   NO 1  NO 2  NO 3   NO 4
Defl       65    +33   +26    +6     0
[[/end box]]
Current in the direction of the discharge