. Methods of making electrolysis surveys. . strung on poles or on the trolley span wdres and be usedfor this purpose solely. This may be done when it is desired toget continuous records for long periods of time, probably at points 12 Technologic Papers of the Bureau of Standards which represent the maximum over-all potentials and whererecords are required by ordinance or needed as evidence, and insome cases it may be found more economical than renting tele-phone wires. For temporary use, however, as when surveys aremade only at infrequent intervals, the use of telephone lines whichare already
. Methods of making electrolysis surveys. . strung on poles or on the trolley span wdres and be usedfor this purpose solely. This may be done when it is desired toget continuous records for long periods of time, probably at points 12 Technologic Papers of the Bureau of Standards which represent the maximum over-all potentials and whererecords are required by ordinance or needed as evidence, and insome cases it may be found more economical than renting tele-phone wires. For temporary use, however, as when surveys aremade only at infrequent intervals, the use of telephone lines whichare already in place is most convenient, there often being idlepairs which are especially suited to the purpose. They usuallyextend to every part of a city, and by trunking through the variousexchanges any two points may be connected to the the over-all potentials seldom exceed from lo to 30 volts thetelephone cables are in no danger from voltage breakdown. Wehave never experienced any disturbance of the telephone service ySwedged Lead. Fig. I.—Method of making permanent connection to rail due to the use of these wires either from noises in parallel lines ordamage to the circuits. When the number of idle pairs availablefor over-all voltage measurements in a certain district is limitedthe pairs may be split, using one wire to connect to each plenty of idle pairs are available, however, it is best toconnect the two wires in parallel, thereby reducing the resistanceof the leads, which in long lines may become considerable. The point of lowest potential on the rails or pipes in any power-house area is the logical place for connecting the lead from thenegative terminal of the instrument. This will usually be thepoint on the rails nearest the negative bus, but this is not neces-sarily so, especially when insulated negative feeders are the other points will usually be compared to this mostnegative one, the contact and connection to the latter should be Ele
Size: 2089px × 1196px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidmethodsofmaking191628mcco
