. The Bell System technical journal . g relative humidity, it isvery desirable to have records which will show continuously the dif-ferences existing between indoor and outdoor temperatures andrelati\e humidities, and in particular to study the effects on theindoor conditions when sudden changes in atmospheric conditionsoccur such as rain storms when the relative humidity outside reaches10()%. It was found that the automatic recorder described abovewould lend itself admirably tf) the study of this problem and thatby the use of a simple relay switching mechanism on the recorder,two wind tunnel
. The Bell System technical journal . g relative humidity, it isvery desirable to have records which will show continuously the dif-ferences existing between indoor and outdoor temperatures andrelati\e humidities, and in particular to study the effects on theindoor conditions when sudden changes in atmospheric conditionsoccur such as rain storms when the relative humidity outside reaches10()%. It was found that the automatic recorder described abovewould lend itself admirably tf) the study of this problem and thatby the use of a simple relay switching mechanism on the recorder,two wind tunnel equipments could be operated with one recorder,enabling temperatures and differences between dry. and wet bulbtemperatures to be recorded alternately on the same chart for bothindoor and outdoor conditions. A recorder of this type was operated during the summer monthsof 1921 at the West Street laboratories of the Western Electric Co.,Inc., to record the conditions in a well ventilated laboratory room 248 BELL SYSTEM TECHNICAL JOURNAL. Fig. 7—Reconl fruiii DoiiMi- RlcokIci- (Dnipariiig liiduur andUiiUloor Coiulilions urstiinTy ri-corhers 249 .iIhuii J.) ItH-i \ 27 Itit .mil ; two windows i-,nli in llic cist amisouth walls. Tlu wind tiunu-l it|iii|)infnt was installed at a luinlit uisix fivt iijH)H a pillar in the center of the room. About ten |x,oplenornuillv work in this hmmii. The outdoor conditions were ohtaincc?!)> mountinj; a winil tunnel wiuiiinient in a standard Weather Bureauinstrument shelter placed at the top of a tower, 14 feet lii^h, whichstands f)n the roof t)f a three story l)uildinj( far enouj^h away fromwalls and other obstacles to jwrniit free circulation of the air. Fi>;s. 7 and 8 show two typical 12 hour records upon which theind(M)r and outdoor relative humiililies have been plotted from thecurves of temiK>ratures and temperature differences recorded by theinstrinnent. A stutl\- of these recorils indicates that large ilifTerencesoften exist
Size: 1241px × 2014px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
