Lindeck, Zeitsch. fuer Inst. 'Kunde, ix. 1889,
p. 233, and B. A. Reports, 1892, p. 139. Of these, Matthieson, and
Dewar and Fleming treat of resistance generally, the latter
particularly at low temperatures.

[Footnote: The following is a list of Dr. Matthieson's chief papers on
the subject of the electrical resistance of metals and alloys: Phil.
Mag. xvi. 1858, pp. 219-223; Phil. Trans. 1858, pp. 383-388 Phil.
Trans. 1860, pp. 161-176; Phil. Trans. 1862, pp. 1-27 Phil. Mag. xxi.
(1861), pp. 107-115; Phil. Mag. xxiii. (1862), pp. 171-179;
Electrician, iv. 1863, pp. 285-296; British Association Reports,
1863, p. 351.]

Matthieson, and Matthieson and Hockin, Klemencic, Feussner, and St.
Lindeck deal with the choice of metals for resistance standards.
Callender's, and Callender and Griffiths' work is devoted to the study
of platinum for thermometric purposes.

The bibliography referring to special points will be given later. The
simplest way of exhibiting the relative resistances of metals is by
means of a diagram published by Dewar and Fleming (loc. cit.), which
is reproduced on a suitable scale on the opposite page. For very
accurate work, in which corrections for the volumes occupied by the
metals at different temperatures are of importance, the reader is
referred to the discussion in the original paper, which will be found
most pleasant reading. From this diagram both the specific resistance
and the temperature coefficient may be deduced with sufficient
accuracy for workshop purposes. In interpreting the diagram the
following notes will be of assistance. The diagram is drawn to a
scale of so-called "platinum temperatures"--that is to say, let R0,
R100, Rt be the resistances of pure platinum at 0 deg., 100 deg., and t deg. C.
respectively, then the platinum temperature pt is defined as

pt = 100 X (Rt-R0)/(R100-R0)

This amounts to making the temperature scale such that the temperature
at any point is proportional to the resistance of platinum at that
point. Consequently on a resistance temperature diagram the straight
line showing the relation between platinum resistance and platinum
temperature will "run out" at the platinum absolute zero, which
coincides more or less with the thermodynamic absolute zero, and also
with the "perfect gas" absolute zero. Platinum temperatures may be
taken for workshop purposes over ordinary ranges as almost coinciding
with air thermometer temperatures. The metals us