Ericsson, John, 1803-1889 · New York : Printed for the author at "The Nation" Press · leaf 284
ELIOMETEB. 255 and the thermometer t are coated with hmip-Llack. A secondthermometer t shows the temperature of the annular space,and consequently that of the enclosure. The A\hole apparatusis mounted on a support having a j)arallactic movement, tofacilitate following the diurnal motion of the sun.… … Before pointing out the peeuliaiities of the contrivancethus described by Pcre Secchi, it will be instructive toexamine his solar intensity apparatus, manufactured byCasella, represented in Fig. 2. The manufacturer publishesthe following statement regarding this instmment; Twothermometers are here…
