. Carnegie Institution of Washington publication. BOLOMETERS. 167 Table VII. —Bolometer-Galvanometer Sensitiveness. Temperature sensitiveness. For 1 mm. de- flection and period given in col. 3. °C. 1X10-6 9X10-6 8X10- 3X10- 2X10-4 5X10-6 r Ibid., for a scale at 1 m. Ibid., for a scale at 1 m and a full period of 15 sees. °C. 4X10- Candle test. a "2 2 ? met. u S c o m a tn g bo met. -a a o> o S J o-S 800 60 . -A u c>2 IrS *. cry 4)" 03 Remarks. In practice for solar spectrum work a full period of 3 sees, and i= ampere is used. Balancing coils of plati- noid. Bolo
. Carnegie Institution of Washington publication. BOLOMETERS. 167 Table VII. —Bolometer-Galvanometer Sensitiveness. Temperature sensitiveness. For 1 mm. de- flection and period given in col. 3. °C. 1X10-6 9X10-6 8X10- 3X10- 2X10-4 5X10-6 r Ibid., for a scale at 1 m. Ibid., for a scale at 1 m and a full period of 15 sees. °C. 4X10- Candle test. a "2 2 ? met. u S c o m a tn g bo met. -a a o> o S J o-S 800 60 . -A u c>2 IrS *. cry 4)" 03 Remarks. In practice for solar spectrum work a full period of 3 sees, and i= ampere is used. Balancing coils of plati- noid. Bolometer is inclosed in water jacket. In practice drifting is minim- ized by placing a short copper wire in series with one of the bolometer arms. Surface bolometer; 23 strips of tin foil; blackened with PtCl2 and soot. Balancing coils of copper wire in separate box. Sensitiveness 556X10-9 gr- cals/cm2/sec. Single Pt. strip mm. in spectrobolometer. 2 arms of tin foil in form of grat- ing. Sensitiveness also given as 127X10-9 gr- cals/cm2sec. Bolometer strips of nickel mm. thick. Balancing coils of platinum wire in oil in sep- arate box. Found deflection proportional to current. Surface bolometer, 4 similar arms, so no compensating re- sistances needed; diagonally opposite arms exposed. Sen- sitiveness also given as 533 X io-9 gr-cals/cm2/sec. Surface bolometer 4 similar arms of platinum foil mm. thick; 2 diagonally op- posite arms exposed to radia- tion surface consists of 12 strips of platinum, 1 mm. wideX32 mm. long, separated by mm., back of which openings are 12 similar strips of the diagonally opposite arm. Bo- lometer currents as high as ampere could be used. Surface bolometer of tin foil mm. thick; 7 strips in each arm. 2 arms of mm. iron wire hammered flat; 3 strips in each Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of
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