50. Proposals for a Standard Temperature for Tropical 
ountries. 
By Pav Brian, 
I am probably not wrong in assuming te other people 
besides myself, engaged in physical and chemical work in India, 
have seriously felt the want of tables su fich as we “and n 
i 
Landolt-Boérnstein’s Physikulisch-Chemische Tabellen and simi- 
lar pon one — constructed for a higher temperature than 
15° C. or 62° F. 0 n20°C. In the year 1892 I consulted several 
analytical ohieiniste on what might be the most convenient 
temperature to be adopted as a standard temperature in such 
intellectual centres as Calcutta, Madras, Bombay, Allahabad, 
and others; and all of them agreed that the conclusion at whic 
I had arrived, after ten years’ experience in Bengal, was correct, 
t h 
of volumetric apparatus ee by Muencke of Berlin, correct 
at 30°C., a ve been using that set with satisfactory resalts 
ever since 1895. A more Satiptote set has been lately made to my 
specification by Mueller-Uri of Braunschweig. 
Besides persons engaged in purely scientific, chemical and 
physical work, it is analytical chemists such as mining and 
metallurgical chemist sts, agricultural chemists, sugar chemists, 
further electricians in charge of electric-testing laboratories, the 
Survey Department and others who are interested in the definite 
vote of a standard temperature for tropical countries, because. 
it is only after a definite temperature has been fixed as a standard: 
temperature that it will be worth while proceeding to the work- 
ing out of percentage and other tables specially useful to people 
working in tropical climates 
.. , 1 am evidently not alone in pean a temperature som - 
where near 30°C. as a suitable standard temperature for Tadia. 
When obtaining, in 1897, a _ potentiometer set for the Physical 
near the mean te iets of the = Uh and in pe ehaaepte . the 
specifications for the standard balances, resistances, ete., for the 
