Chicago : Engineering and Contracting Pub. Co. · leaf 223
essary at the point which passesthrough the cover, the hole is madetriangular in shape and covered with an ordi-nary object glass through which the stem oftin- thermometer may he seen Readings made through the glass should be calibrated to theangle of observation, which may be madeconstant by… … Fig. 16—Apparatus for Determining Paraf-fin Scale. heated in such a manner that the thermometerregisters an increase of 5° C. per minute. Thetemperature at which the bitumen touches apiece of paper placed in the bottom of thebeaker is taken as the melting point. Deter-minations made in the manner…
Buildings
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
