1. The authors spent the month of August I925 on the Gornergrat, near Zermatt (Switzerland)
at an altitude of 3 Ioo meters, with a view of measuring the distribution of the energy over …

Adiniinished image of aslit, onwhich the filament of a half-watt lamp is focussed, is projected
by means of a microscope objective on the photographic plate or other object of which the …

The thermopile is designed to be quick-reading and free from zero-errors, as well 8s sensitive.
The cold junctions are in contact with metal masses which keep down their temperatwe, …

IN the application of the thermoelement for measuring radiation, the advantage of enclosing
the element in vacuo has often been enunciated, and determinations have frequently been …

In the further research of the liquid crystals, the results of which we intend to communicate
hereafter, thé same rnethod as described in a former cornmunication was used again.(These …

WH JULIUS has suggested that the distribution of the radiating power of the sun along its
radius may be derived from measurements of the radiation during the course of a central …

1 The mean err, or of the galvanometer we used was~ 0"---~ microvolt, corresponding to
less than 2~ erg per sec. The quickness of response is quite satisf'actory. When radiation is …

ABSTUCT. The galvanometer is designed to secure rapid indication and steadiness of
reading without unduly sacrificing the sensibility. The coil is long and narrow, and therefore of …

h method of measuring spectral absorption is described whereby all data may be obtained
from a single photographic exposure. For this purpose the normal spectrograph slit is …

In this integral the funet. ion F (rhk) is zero without the sphere of act ion, therefore this integml
has only to be exlended 10 this l'egion. I) Thus the abIlOl'mal character, stated by KAMERJ. …