. Transactions. intothese impressions. Then, by lightly tapping theopposite side of the yoke containing the twoscrews, a light impression of their exact locationcan be obtained on the specimen. These pointsare then enlarged by the use of the double-pointed center punch and the yokes carryingrods and frames are firmly attached to the testpiece. The bolts holding the upper frame to thetwo rods are next taken off and the upper frameis removed. The specimen is then passed upthrough the furnace until the rods appear abovethe top and the upper frame is again fastenedto the rods. The furnace is then
. Transactions. intothese impressions. Then, by lightly tapping theopposite side of the yoke containing the twoscrews, a light impression of their exact locationcan be obtained on the specimen. These pointsare then enlarged by the use of the double-pointed center punch and the yokes carryingrods and frames are firmly attached to the testpiece. The bolts holding the upper frame to thetwo rods are next taken off and the upper frameis removed. The specimen is then passed upthrough the furnace until the rods appear abovethe top and the upper frame is again fastenedto the rods. The furnace is then placed on astand and the specimen placed in the jaws ofthe testing machine, after which the dials are attached to the frame and adjusted to read zero. The completely assembled apparatus is shown in Fig. 5. When the desired temperature and thermal equilibrium have been reached, a unit load approximating 1500 to 3000 lb. is applied, and the dials are again set at zero. Readings are then taken at increments of 500. Fig. 4.—Heating FUKNACE. A—Inner tube andBASE (welded). B—Outer tube. C—Topplate. d—m i c a n i t eand asbestos insula-TION. E—InfusorialEARTH. F—Terminals. G—NiCHROMB RESISTORS. H. J, FRENCH 91
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
