...Standard Yard," or brass " standard yard of 1760," bearing the proportion of 30 inches to 30'1393 inches, the length of a pendulum vibrating seconds in the latitude of London at C2° Fahrenheit, and in a vacuum at the level of the sea. 2. Capacity.— The " Imperial Standard...

...destroyed by fire in 1834. It had been originally defined as having at 62° Fah. a length of • i ,3y j of the length of a pendulum vibrating seconds in the latitude of London at the sea-level. But this provision for its restoration was repealed and a new standard bar was constructed...

...cubic inch, of that substance. But what is an inch? It is determined, we find, as a certain fraction of the length of a pendulum vibrating seconds in the latitude of London. A second, we know, is a certain portion of a mean solar day, and is practically determined by a reference...

...lightning. The Society took a very active part in the measurement of a degree of latitude, afterwards in the length of a pendulum vibrating seconds in the latitude of London, and in the comparison of the British Standards with the Linear Measure adopted in France. A committee...

...lightning. The Society took a very active part in the measurement of a degree of latitude, afterwards in the length of a pendulum vibrating seconds in the latitude of London, and in the comparison of the British standards with the linear measure adopted in France. A Committee...

...lightning. The Society took a very active part in the measurement of a degree of latitude, afterwards in the length of a pendulum vibrating seconds in the latitude of London, and in the comparison of the British standards with the linear measure adopted in France. A Committee...

...1816 we find that he was a member of a Committee " to consider of the proper means of ascertaining the length of a pendulum vibrating seconds in the latitude of London." In 1819 he was appointed member of a Commission of Inquiry, with the view of establishing and preserving...

...inches, or parts of a cubic inch, of that substance. An inch is determined as a certain fraction of the length of a pendulum vibrating seconds in the latitude of London. A second is a certain portion of я mean solar day, and is practically determined by a reference to...

...Endeavors to find a Standard of Length. 1798, page 185, &o. Kater's Account of Experiments for determining the Length of a Pendulum vibrating Seconds in the Latitude of London. 1818, page 33, &c. Kater on the Length of the French Metre as compared with-Shuckburgh's Scale, 0 -...

...based on information supplied by William Hyde Wollaston (l766-l828) and Playfair who had determined the length of a pendulum vibrating seconds in the latitude of London to be 39.l3047 inches, of which Bird's yard contained 36. Both scientists alluded to the necessity...