Horological disquisitions concerning the nature of time, and the reasons why all days, from noon to noon, are not alike twenty four hours long in which appears the impossibility of a clock's being always kept exactly true to the sun : with tables of equation, and newer and better rules ... how thereby precisely to adjust royal pendulums ... : with a table of pendulums, shewing the beats that any length makes in an hour ... / by John Smith ... ; to which is added The best rules for the ordering and use both of the quick-silver and spirit weather-glasses, and Mr. S. Watson's rules for adjusting a clock by the fixed stars.

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Author:	Smith, John, fl. 1673-1680.
Title:	Horological disquisitions concerning the nature of time, and the reasons why all days, from noon to noon, are not alike twenty four hours long in which appears the impossibility of a clock's being always kept exactly true to the sun : with tables of equation, and newer and better rules ... how thereby precisely to adjust royal pendulums ... : with a table of pendulums, shewing the beats that any length makes in an hour ... / by John Smith ... ; to which is added The best rules for the ordering and use both of the quick-silver and spirit weather-glasses, and Mr. S. Watson's rules for adjusting a clock by the fixed stars.
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Print source:	Horological disquisitions concerning the nature of time, and the reasons why all days, from noon to noon, are not alike twenty four hours long in which appears the impossibility of a clock's being always kept exactly true to the sun : with tables of equation, and newer and better rules ... how thereby precisely to adjust royal pendulums ... : with a table of pendulums, shewing the beats that any length makes in an hour ... / by John Smith ... ; to which is added The best rules for the ordering and use both of the quick-silver and spirit weather-glasses, and Mr. S. Watson's rules for adjusting a clock by the fixed stars. Smith, John, fl. 1673-1680. London: Printed for Richard Cumberland ..., 1694.
Subject terms:	Time, Equation of -- Early works to 1800. Horology -- Early works to 1800.
URL:	https://name.umdl.umich.edu/A60473.0001.001
How to cite:	For suggestions on citing this text, please see Citing the TCP on the Text Creation Partnership website.

Table of Contents

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title page

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TO THE READER.

A Table of Equations, Shewing the true Length of every Natural-Day, or the Seconds of Time that they are either Longer or shorter than XXIV. Hours.

A Second Table of Equations, Shewing how to order a well-adjusted Clock, so as that the whole Year round it shall not differ above the Sixteenth Part of an Hour from the Sun, or 3′ 45″.

part

The Table for dividing the Nut of a Pendulum Screw.

The Uses of the Table for dividing the Nut of a Pendulum Screw.

The manner of Rightly fixing, or Setting up Pendulums to go well.

A Table of Crown-Wheel'd Pendulums, shewing the number of Beats made in an Hour, by any length of Inches and Quarters, from One Inch to Twelve, the Bob about an Ounce in Weight.

A Table of Royal Pendulums, shewing what Beats any Length makes in an Hour from 12 to 60 Inches, the Bob 2 Pound Weight or more.

The Table of Royal Pendulums continued, from 3 Foot long to 30, for the Use of such as make Church and Turret-Clocks.

The best Rules for the ORDERING and USE Both of the Quick-silver and Spirit WEATHER-GLASS.

Of the Uses of the Baroscope, or Quick-silver Weather-Glass.

An Addition of some Natural Predictions of Fair and Foul Weather: And first of Fair Weather.

Signs of Rain and Wet Weather.

Some Uses of the Spirit Weather-Glass.

The Way of finding how much a Pendulum Clock has gained or lost in a Day, Week or a Month, to the nicity of Two or Three Seconds, &c.