. Brake tests; a report of a series of road tests of brakes on passenger equipment cars made at Absecon, New Jersey, in 1913 . served by means of an electric pyrometer, the thermo-couple of which was inserted in a hole drilled from the back of the shoediagonally through to the face. The elliptical shaped opening markedFor Pyrometer (Figs. 151 to 154) illustrates the position of thethermo-couple in the shoe. The thermo-couple was adjusted so that itwas close to or touching the wheel during the stop. The object beingto obtain if possible the actual temperature of the working metal at thesurface
. Brake tests; a report of a series of road tests of brakes on passenger equipment cars made at Absecon, New Jersey, in 1913 . served by means of an electric pyrometer, the thermo-couple of which was inserted in a hole drilled from the back of the shoediagonally through to the face. The elliptical shaped opening markedFor Pyrometer (Figs. 151 to 154) illustrates the position of thethermo-couple in the shoe. The thermo-couple was adjusted so that itwas close to or touching the wheel during the stop. The object beingto obtain if possible the actual temperature of the working metal at thesurface of the shoe. The diagram of the arrangement of the thenno-couple in the drilled opening through the shoe is shown in Fig. 150. 250 483. During the tests the time of each rise of 40 degrees Fahren-heit as indicated by the thermo-couple, was noted on the dynamometerrecord as shown by the upper Hne marked Temperatiu-e rise in The temperature thirty seconds after the maximum temperatureoccurred was noted as well as the initial and maximum temperaturesof the brake shoes. The temperature of the wheel was also measured. Fig. 150. BRAKE SHOE of applying thermo-couple to brake shoe. previous to each test by means of a mercury thermometer placed incontact with the wheel and insulated from the atmosphere. 484. Dming the second series of tests with the reduced areaplain, solid flanged, slotted flanged and reduced area flanged brakeshoes pyrometer readings were not taken. Only the initial and finaltemperatures of the brake shoe were noted. Sparking. 485. Observations of the sparking at the brake shoe were madeduring the first series of tests on plain solid and plain slotted shoes. A 251 magnet similar to the one used for indicating rise in temperature wasmounted on the bridge of the dynamometer and its circuit was con-trolled by an observer stationed near the test wheel. The line markedSparks in Fig. 149 illustrates characteristic sparking records. 486. Five obse
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