Oeuvres complètes. Tome IV. Correspondance 1662-1663

[p. 446]

N^o 1174.
[Holmes] à [R. Moray].
1663.
Appendice au No. 1173.

La Pièce se trouve à Londres, Royal Society¹⁾.

An Account of the going of two watches at Sea, from the 28^th of April to the 4^th of September 1663.

The watches were wound up every day at 12 of the Clock at Noon, the distinction of the greater watch is A; the lesser B. and their difference was always observed at 12 the next day.

1663.	At Day.		Minutes.	Parts, wherof 11 in a minut.
April	29	At 12. B before A.		4
	30			8
May	1		1	1
	2		1	5
	3	B stood, and was set by the other.
	4	B. before A.		5
	5			10
	6		1	4
	7		1	9
	8		2	3
	9		2	8
	10		3	2
	11		3	7
	12	The Bullet fell off from the pendulum of B, & could not be adjufted till the 18.
	18	when it was set a going	0	0
	19	B. before A.		5

1) Ce rapport fut présenté dans la séance du 21 octobre 1663 (V. st.).

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1663.	At Day.		Minutes.	Parts, wherof 11 in a minut.
May	20	B. before A.	0	10
	21		1	4
	22		1	9
	23		2	3
	24		0	0
	25			5
	26			10
	27		1	4
	28		1	9
	29		2	3
	30	B. stood, but was oyled and set going with the watch A. June 3
June	3
	4	B. before A.		4
	5			8
	6		1	1
	7		1	5
	8		1	9
	9		2	2
	10		2	6
	11		2	10
	12		3	3
	13		3	7
	14		4	0
	15		4	4
	16	B. stood about 2 hours, and was set going adjusted with A. 16 June.
	17	B. before A.		4
	18			8
	19		1	1
	20		1	5
	21		1	9
	22		2	2
	23		2	6
	24		2	10

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1663.	At Day.		Minutes.	Parts, wherof 11 in a minut.
June	25	B. before A.	3	3
	26		3	7
	27		4	0
	28		4	4
	29		4	8
	30		5	1
July	1		5	5
		B. stood a little in the afternoon, and set a going again at 6 of clock adjusted with A.
	2	B. before A. at 12		2
	3			5
	4			8
	5		1	0
	6		1	3
	7		1	6
	8		1	9
	9		2	1
	10		2	4
	11		2	7
	12		2	10
	13		3	2
	14		3	5
	15		3	8
	16		4	0
	17		4	3
	18		4	6
	19		4	9
	20		5	1
	21		5	4
	22		5	7
	23		5	10
	24		6	2
	25		6	5
	26		6	8
	27		6	10

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1663.	At Day.		Minutes.	Parts, wherof 11 in a minut.
July	28	B. before A. at 12	7	0
	29		7	3
	30		7	6
	31		7	9
August	1		8	1
	2		8	4
	3		8	7
	4		8	10
	5		9	5^2)
	6		9	5
	7		9	8
	8		10	0
	9		10	3
	10		10	6
	11		10	9
	12		11	1
	13	B. adjusted with A. at Lisbone.
	14	B. before A.	0	3
	15		0	6
	16		0	9½
	17		1	1
	18		1	4
	19		1	8
	20		2	0
	21		2	3
	22		2	6
	23		2	10
	24		3	2
	25	Watch B. stood from 9 of clock at night till 10.
	26	B. before A.	0	3
	27		0	6
	28		0	9
	29		1	1

2) Problablement il faut lire: 2.

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1663.	At Day.		Minutes.	Parts, wherof 11 in a minut.
August	3	B. before A.	1	4
	31		1	7
September.	1		1	10
	2		2	2
	3		2	5
	4		2	8

August	19.	We being in the Latitude of 39^d 10^m and distant from our departure at Lisbone 60 Leagues or 180 miles, which makes 4^d 45^m departure of Longitude, J found the watches to be a quarter of an hour before the Sun.
August	22.	We being in the Latitude of 41^d 7^m and to the Westward of our departure 78 Leagues or 234 miles, which makes 5^d 2^m (45 miles making one degree), the watch was a quarter of an hour and 5 minutes before the Sun.
August	24.	We being in the Latitude of 43^d 22^m and to the Westward of our departure 112 Leagues or 336 miles, and 44 miles making one Degree, which makes 7^d 37^m and then J found the watches to be before the Sun half an hour.
August	26.	We being in the Latitude of 46^d o^m and from our first meridian 136 Leagues or 408 miles, which makes 9^d 22^m (44 miles answering to one Degree), J found the watches to be before the Sun three quarters of an hour.
August	29.	We being in the Latitude of 47^d and from our first meridian 105 Leagues or 315 miles, J found the watches to be before the Sun halfe an hour; 41 miles making one degree of Longitude in the Latitude of 47^d o^m which makes 7^d 41^m difference of Longitude.
September.	1.	We being in the Latitude of 49^d 6^m and departed from my first meridian 22 Leagues or 66 miles (39 miles making one Degree of Longitude) J found the watches to differ little from the Sun.
September.	5.	Jt being very hazy weather that Jcould not try the watches with the Sun from the first untill the 5^th September, and then J found the watches to be after the Sun almost halfe an hour; the Sun making 12, and the watches but halfe an hour past 11 of the Clock.

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August 13^th we came out of Lisbone, and there J adjusted the watches, and set them going according to the course of the Sun at Lisbone, and these Observations J took coming home, being far Westward, with a Ring Diall when the Sun & Opportunity presented.