CONTENTS. 
PREFACE ttt teeeeneneneeaeasaseeneneeaaascsancecarsaseresssteassccasssaraesssseasseaseeeaeas teense cesses census tes 
IntRODUCTION— 
Description and Position of the Observatory,---+--+-++++se++eeeseeeeeeseeeeeneeeeeeeeseeanenes 
Personal Establishment, apoceiednluctonilsinal «aula tcle'e'vic auinicn'els uid nislelcnc issue denicnaiens as aahiae pele adeiceen sa 
Maenericat InstRUMENTS— 
Declinometer— 
Description of the Declinometer, «-++--+:++-+sssseeeeeteenneeeceneesceeeeeeeeteeeeense ees 
Value of the Scale Divisions, 
Reading for Magnetic Axis, 
Effect of Bifilar and Balance Magnets, --+++-++ss+eseeeseesererenaceneeaceecenseeeseees 
Effect of Copper Ring, --2-eceseeeec ec ecees sees sec ccseeeccceensesecsescrnceerensrseeceenes 
Suspension Thread and its Torsion Force,:---:++++sssesesseceeerenteeeneeeseeeeeeecens 
Values of = ane aiyis(e|ainiexin pula wivis apsin/alcelsmaae'sieisiaetacduladelandniatsiecaiser nan caldedaadcle ck oa eae 
Facts relating to Suspension Threads,....--+--+ssesseseceseeeeeeeesscneeenecenceceetees 
Absolute Declination, metals atalsia asin cintalslatein en wialc sin o'aldeletdsiaiaiacele els oiels's ce so wine a7u eee e dealer eee 
Method of Observing, Gumtead de slenas au divide acer one's nists sineilevioimasicntisd osias sm sleee nee aapew ete 
Bifilar Magnetometer— 
Description of the Instrument, ...-.--01s-s-ecceeseesoreecsnsreccarssenscarseneannsanesesss 
Constants for the Reduction of Observations after altering the Reading of the 
Torsion Circle, ---+---++ss+s++sseseceeceecencsccnsccscececescsceecncerecaeccetesenees 
Adjustments, --+++++--seeeereceeeceeeseeneaecceseaerecenstaeseeeeneesseeseeseseceresserseesns 
Value of Scale Divisions, ...+--+1.+2+sssesesecececescnssececeenenceecsncecseaserr ase eneane 
Times Of Vibration, -+--++cececssseceseecececenenetctenencnasaseeasscaseeeceeterncnseseoeres 
Mode of Observing and Reductions, -++-++-ssss+sseseneeresseeneeeencecesteeaeeeces eee 
Valuies of Ke amd qy:---seeee ser ece crest cenececeeeseecnersceecsesnccscscsscssteenesues erates 
Sources of error in determining the Temperature of the Magnet, «..------+-+++- 
Absolute Horizontal Intensity, .....-----s--s-ceseseeessetsesernscesceseenescnsecsensees 
Balance Magnetometer— 
Description of the Instrument,.--.--2:+-.c1:-sssesseeeeeseeeeseecenseeceseneeereceecnees 
Value of Micrometer Divisions, «-++-----+0-:e++sececesenecescnseccccsenseeeecerrarenees 
Deviation of Magnetic Axis from the line joining the Bisco Crosses, --+-+- 
Times of Vibration in a Horizontal Plane, 
Times of Vibration in a Vertical Plane, --------++++++++++0+.- 
Effect of other Magnets, ---...--se-csccscccscsccscaceecceceesecesssccsencesee Seeneped are. 
Observations and Reductions, -+++.-+s.ssse-ssesserscnccsaees., teeteeeceesssasaeeerseeeees 
Values of k and y trent tea eeeeenceeeesceveesaneeeenes aele.g daly niviacjatoia Pinan eainiiele alblen'mendisiaetaid el 
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