Page:Philosophical Transactions - Volume 003.djvu/192

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Full Moon, and the Quarters, Mr. Henry Philipps hath framed a Table for the rectification of this Error in the River of Thames; to be found in Number 34, p, 656, 657, of the Phil. Transactions.

7. The water flows nor ebbs equal spaces in equal times, but its Velocity is strongest at the first both of the Flood and Ebb, and so gradually decreaseth until Fu1l Sea or Low water. This is observ'd in Spring-Tydes only, as you may see by the following Table, which I have made from my Observations of our Tydes here. To make them always so near as to half inches, is neither easie, nor material, or usefull. But this hath been likewise observed, that it hath flowed or ebbed at the first of the Tyde one foot in 6. minutes, or that then the Tyde ran out afoot in 6. minutes, or did rise so much in height.

 

The Tyde-Table by Hour-quarters.

			Hours							Hours
			& quart.	Feet	Inch				&	quart.	Feet.	Inch.
For the flowing of 5. hours.	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \ \end{matrix}}\right.}$	1…	1——	2——	7½	$\scriptstyle {\left.{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \ \end{matrix}}\right\}\,}$	For the Ebbing of 7. hours.	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \ \end{matrix}}\right.}$	1…	1——	2——	7½	$\scriptstyle {\left.{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \ \end{matrix}}\right\}\,}$
			2——	2——	6.					2——	2——	6.
			3——	1——	6.					3——	2——	6.
			———	2——	6.					———	2——	6.
			1——	2——	6.					———	———
			2——	2——	5½					———	———
			3——	2——	5.					———	———
		2…	———	2——	5.				2…	———	9——	0
		3…	1——	2——	3.					———	———
			2——	2——	3.					———	———
			3——	2——	3.					———	———
			———	2——	3.				3…	———	8——	0
			1——	2——	2.				4…	———	———
			2——	2——	1.					———	6——	9.
			3——	2——	1.					———	———
		4…	———	2——	1.				5…	———	5——	0
			1——	1——	9.				6…	———	———
			2——	1——	8.					———	4——	0
			3——	1——	8.					———	———
		5…	———	1——	8.				7…	———	3——	0
		45. feet circiter.							45. feet circiter.