. The street railway review . a groovenn the inside which entirely prevents entrance of light to the the opposite si<le of Ihc camera is a linlo lo receive the axle ofthe clockwork which is firmly secured hy uuaiis .if ilu- milled ju-ad27. This clockwork rotates a brass drum inside the camera oncein 24 hours. Fig. 5 shows a side view of the camera with a limingring about 20 mm. wide, with divisions from i to , 12 hours byquarter hours. At the side of the opening in the camera and atthe right-hand side of the timing ring there is an index mark upona hinged plate by means of which th
. The street railway review . a groovenn the inside which entirely prevents entrance of light to the the opposite si<le of Ihc camera is a linlo lo receive the axle ofthe clockwork which is firmly secured hy uuaiis .if ilu- milled ju-ad27. This clockwork rotates a brass drum inside the camera oncein 24 hours. Fig. 5 shows a side view of the camera with a limingring about 20 mm. wide, with divisions from i to , 12 hours byquarter hours. At the side of the opening in the camera and atthe right-hand side of the timing ring there is an index mark upona hinged plate by means of which the revolving cylinder can be set10 any desired starting time. The clockwork is wound up by open-ing the door which will be seen in Fig. 5 hinged down, and rotatingthe cylinder inside the camera in the clockwise direction. Thecamera is provided with a handle on top by means of which it canbe removed. Diagrams A and B represent portions of actual records, showingllio benefit of the knnwleilge gained by the use of this recording. B m » ■ • >« 1 no. 6. diaphrattni* cant on Ihr lop, which is covered with fell lo prolerlII ;iij:iiini siiilden variations of temperature. The lop of the closed instrument. In diagram A it will be noticed that the percentage ofCOj seldom rises above to per cent, and is often as low as 5 percent. In the diagram B, where the fireman was aware that theinstrument was connecled,. it rises considerably above the otheraverage. The sensitiveness of the instrument is amply proved byIhc fluctuations of these records. It is generally recognized thai complete insight into the condi-tions in which the bfiiler furnace installation is at any time workingcan only be provided frum a knowledge of the COi obtained in theproducts of combuslicin. It is on this account that efforts have beenmade lo produce inslruments for the former, which would Ihemselves automatically and continuously show the of writer is glad to be able lo stale lb. re is
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
