IMAGE EVALUATION
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CIHM/ICMH

Microfiche

Series.

CIHIVl/iCIVIH
ColScstion de
microfiches.

Canadian Inatitut* for Hiatorical Microraproductiona / Inatitut Canadian da microraproductiona hiatoriquaa

Taehnical and Bibliographic Notaa/Notas tachniquaa at bibliographiquaa

Tha Inatltuta haa attamptad to obtain tha baat
original copy avallabia for filming. Faaturaa of thia
copy which may ba bibliographlcally unlqua.
which may altar any of tha imagaa In tha
raproduction. or which may aignlf Icantly changa
tha uaual mathod of filming, ara chackad balow.

Tha
tot

L'Inatitut a microfilm* la malllaur axamplaira
qu'll lui a At* poaaibia da aa procurar. Laa dAtaila
da oat axamplaira qui aont paut-Atra uniquaa du
point da vua bibliographiqua. qui pauvant modlfiar
una imaga raprodulta, ou qui pauvant axigar una
modification dana la mAthoda normala da filmaga
aont indiquAa ci-daaaoua.

Tha
poa

oft

□ Colourad covara/
Couvartura da coulaur

□ Covara damagad/
Couvartura andommagAa

□ Covara raatorad and/or iaminatad/
Couvartura raataurAa at/ou palliculAa

□ Covar titia miaaing/
La titra da couvartura manqua

I I Colourad mapa/

Cartaa gAographiquaa an coulaur

Colourad ink (i.a. othar than blua or black)/
Encra da coulaur (i.a. autra qua biaua ou noira)

□ Colourad plataa and/or illuatrationa/
Planchaa at/ou illuatrationa an coulaur

Q Bound with othar matariai/
RalM avac d'autraa documanta

Tight binding may cauaa ahadowa or diatortion
along intarior margin/

Laraiiura aarrAa paut cauaar da i'ombra ou da la
diatortion la long da la marga IntAriaura

Blank laavaa addad during raatoration may
appaar within tha taxt. Whanavar poaaibia, thaaa
hava baan omittad from filming/
11 aa paut qua cartalnaa pagaa blanchaa ajoutAaa
lora d'una raatauratlon apparaiaaant dana la taxta,
mala, loraqua cala Atalt poaaibia, caa pagaa n'ont
paa 4n§ f llmAaa.

Additional commanta:/
Commantalraa aupplAmantairaa:

D
D
D

D
D
D
D

Colourad pagaa/
Pagaa da coulaur

Pagaa damagad/
Pagaa andommagAaa

Pagaa raatorad and/or Iaminatad/
Pagaa raataurAaa at/ou paiiiculiaa

Pagaa diacoiourad, atalnad or foxad/
Pagaa dAcolorAaa, tachatAaa ou piquAaa

Pagaa datachad/
Pagaa dAtachAaa

Showthrougli/
Tranaparanca

Quality of print varias/
QualltA inigala da I'lmpraaaion

Includaa aupplamantary matariai/
Comprand du matArial aupplimantaira

Only adition avallabia/
Saula MItlon diaponlbia

Pagaa wholly or partially obacurad by arrata
alipa, tiaauaa, ate, hava baan rafllmad to
anaura tha baat poaaibia imaga/
Laa pagaa totalamant ou partlaliamant
obacurclaa par un fauiilat d'arrata, una palura,
ate, ont At* fllmAaa i nouvaau da fapon A
obtanir la malllaura imaga poaaibia.

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IMQ

tha
aiof
oth
nrai
aior
orH

Tha
ahal
TIMI
wM<

Map

difh

antii

baflt
right
raqu
mati

Thia itam ia fllmad at tha raduction ratio chackad balow/

Ca document aat filmA au taux da rAduetion IndiquA ci-daaaoua.

10X 14X 1IX 22X

2BX

aox

12X

ItX

»X

a«x

a2x

The copy fllm«cl h«r« has bacn raproduocd thanka
to tha ganaroalty of:

Univtnity of Altorta
Edmonton

L'axamplaira filmi f ut raproduit grica i la
gAfiAroaitA da:

Univtnity of Albtrta
Edmonton

Tha imagaa appaaring hara ara tha baat quality
poaaibia oonaMarlng tha condition and lagibillty
of tha original copy and in icaaplng with tha -
filming contract apadf loatlona.

Original oopiaa in printad papar covara ara fHmad
baginning with tha front oovar and anding on
tha laat paga «with a printad or illuatratad impraa*
•Ion. or tha back cover wwhan appropriato. All
othar original copiaa ara fUmad baginning on tha
firat paga with a printad or illuatratad impraa>
•Ion. and anding on tha laat paga with a printad
or illuatratad impraaaion.

Tha laat racordad frama on aach microfleho
•hall contain tha aymbol — ^ (moaning "CON-
TINUED"), or tha symbol ▼ (moaning "END"),
whicfiavar appilaa.

Laa imagaa auivantaa ont 4tA raproduita^ avoc !•
piua grand soin. compta tanu da la condition at
da la nattat* da l'axamplaira film*, at w
nonformitA'avac laa conditiona du contrat da
filmaga.

Laa aKamplairaa origlnaux dont la couvartura an
papiar aat ImprimAa aont filmte an commandant
par la pramiar plat at an tarminant aoit par la
damlAra paga qui eomporta una amprointa
d'impraaaion ou d'illuatration, soit par la tacond
plat, aaion lo caa. Toua laa autraa axamplairas
origlnaux aont filmte an commandant par la
pramMra paga qui eomporta una ampralnta
dimpraaaion ou d'illuatration at an tarminant par
la damlMa paga qui eomporta una talia
ampralnta.

Un daa symbolaa auivanta apparattra sur la
damiira imaga da ehaqua microfiche, salon la
caa: la symbola — »• aignifia "A SUIVRE", la
•ymbola ▼ aignifia "FIN".

charta. ate., may ba fHmad at
diffarant raduction ratioa. Thoaa too larga to bo
antlraly included in ona axpoaura ara fllmad
boglrming in tha uppar laft hand comar. laft to
right and top to bottom, aa many framaa aa
required. The following diagrama IHuatrate the
method:

Lea eartea. planchea. tableaux, etc., peuvent Atra
f limAa A daa taux da rAduction diff Arents.
LorM|ue le document eet trop grand pour Atra
reproduit en un aeul clichA. il est f iimA A partir
da Tangle aupArieur gauche, de gauche A droite,
et de haut en bee. en prenent le nombre
d'Imagae nAceaaaire. Lee diagrammee suivanta
illuatrant la mAthode.

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ReprinUdfrom the >Io.thlt Not.cbs of thb Rot.t. AsmoKOMiCAr. Soc.ktt

Vol. LV. No. I, ' '

NOTE ON MR. STONE'S THEORY OF THE MEASURE

OF TIME.

Professor SIMON NEWCOMB.

<.*^'

■IS
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ml
111

Nov. 1 894- Prof. Newcomh, Theory of the Measure of Time. 3

Note on Mr. Stone's Theory of the Measure of Time.
By Professor Simon Newcomb.

The discussion with Mr. Stone has now reached a stage w}iere
nothing remains to be done on my part except to invite Mr.
Stone's attention to the conclusions from his theory, as he states
them in the May number of the Monthly Notices.

A copy of Le Verrier's Tables du Soleil has been in my
possession since the year 1859. If, with the tables in this book,
I compute the sidereal time of mean moon on 1892, January 6,
and thence the tabular right ascension of the Moon from
Hansen's tables at the moment of its transit over the meridian of
Oxford, on that date, I find a difference between the tabular and
observed right ascension of i'"36. The result will be substantially
the same if I use the older tables of Carlini.

Mr. Stone maintains that this result is due to my failure to
apply a certain correction to the numbers of Le Verrier's tables,
which correction is not a function of anything contained in the
tables, or of the epoch of any natu**al event, but of the date when
a certain office, three thousand miles away, began to use the
tables in computing the solar ephemeris. In his last note on the
subject he gives precision to this conclusion by stating explicitly
that if the office in question had not begun the use of the tables
until 1892, the result would have been o''io, instead of i''36.
The statement is still further strengthened by his answer to my
second question, that o'"io would also have been the result if
Carlini's tables had been continued to the present time in the
Nautical Almanac Office, though, if I make the computation with
Carlini's tables now, I shall get nearly i''36, the same as with
Le Verrier's tables. It thus seems, according to Mr. Stone's
theory, that the results which I now get from tables are different
from what they would have been had a change of tables not been
made in the Nautical Almanac Office.

Bpottitwi'ivle (t Co. Prmltri, Mtic-urtei Square, London.

(^Jl^^ 4