lectrical pressure at a temperature of 62 deg. F. between
the poles or electrodes of the voltaic cell known as Clark's cell may
be taken as not differing from a pressure of 1.433 volts by more than
an amount which will be determined by a sub-committee appointed to
investigate the question, who will prepare a specification for the
construction and use of the cell.

(15) That an alternating pressure of 1 volt shall mean a pressure such
that the square root of the time average of the square of its value at
each instant in volts is unity.

(16) That instruments constructed on the principle of Sir W. Thomson's
quadrant electrometer used idiostatically, and for high pressure
instruments on the principle of the balance, electrostatic forces
being balanced against a known weight, should be adopted as Board of
Trade standards for the measurement of pressure, whether unvarying or
alternating.

We have adopted the system of electrical units originally defined by
the British Association for the Advancement of Science, and we have
found in its recent researches, as well as in the deliberations of the
International Congress on Electrical Units, held in Paris, valuable
guidance for determining the exact magnitudes of the several units of
electrical measurement, as well as for the verification of the
material standards.

We have stated the relation between the proposed standard ohm and the
unit of resistance originally determined by the British Association,
and have also stated its relation to the mercurial standard adopted by
the International Conference.

We find that considerations of practical importance make it
undesirable to adopt a mercurial standard; we have, therefore,
preferred to adopt a material standard constructed in solid metal.

It appears to us to be necessary that in transactions between buyer
and seller, a legal character should henceforth be assigned to the
units of electrical measurement now suggested; and with this view,
that the issue of an Order in Council should be recommended, under the
Weights and Measures Act, in the form annexed to this report.

_Specification referred to in Resolution 10._

In the following specification the term silver voltameter means the
arrangement of apparatus by means of which an electric current is
passed through a solution of nitrate of silver in water. The silver
voltameter measures the total electrical quantity which has passed
during the time of the experiment, and b