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A modified gaede gauge
NOTES
FI~OM T H E P H Y S I C A L L A B O R A T O R Y OF THE UNITED GAS IMPROVEMENT COMPANY.* A M O D I F I E D G A E D E GAUGE. By Enoch Karrer.
THIS is an improvement in the gauge described previously by the author. 1 In the .gauge previous.ly described all rubber parts of the short Gaede gauge were eliminated by the use of a ground-glass joint, The present improvement consists in eliminating the groundglass joint. The mercury reservoir is a steel cylinder, connected to the compression chamber by means of a small steel tube. This small steel tube has a helix which allo.ws of mechanical freedom sufficient so that the mercury reservoir may be raised and lowered the desired height. The compression chamber, with its calibrated capillary tube, is made of glass as before. The connection between the glass and steel parts may be accomplished by using hard wax, by a platinum cylinder connection, or by soldering. This manner of using a mercury reservoir is suggested for other apparatus where either adjustable volume or pressure is required. Development of the Steel Car. H. P. HOFFSTOT. (Railway .Age, vol. 64, No. 9, P. 46I, March I, I918.)--The change from the use of wood to steel in the construction of coal cars in America was extremely gradual in its development, although many years ago a few all-steel cars were built and placed in operation by some of the steel companies. In the early nineties C. T. Schoen commenced making pressed-steel car shapes in his little plant in lower Allegheny, and for years supplied the railroads with pressed-steel centre plates, side bearings, stake pockets, push-pole pockets, etc., for use in connection with the construction of wooden cars. During the same time The Fox Plant in the same locality was furnishing pressed-steel trucks and truck specialties to railroads for use on wooden equipment. About 2895 Mr. Schoen conceived the idea of building steel cars on a large scale. The following year the first steel cars were ordered by the Pittsburgh, Bessemer and Lake Erie Line, and shortly after by the Pittsburgh and Western and the Pittsburgh and Lake Erie. * Communicated by the Manager. ~Physical Review, vol. vi (1915), p. 51. 555
FI~OM T H E P H Y S I C A L L A B O R A T O R Y OF THE UNITED GAS IMPROVEMENT COMPANY.* A M O D I F I E D G A E D E GAUGE. By Enoch Karrer.
THIS is an improvement in the gauge described previously by the author. 1 In the .gauge previous.ly described all rubber parts of the short Gaede gauge were eliminated by the use of a ground-glass joint, The present improvement consists in eliminating the groundglass joint. The mercury reservoir is a steel cylinder, connected to the compression chamber by means of a small steel tube. This small steel tube has a helix which allo.ws of mechanical freedom sufficient so that the mercury reservoir may be raised and lowered the desired height. The compression chamber, with its calibrated capillary tube, is made of glass as before. The connection between the glass and steel parts may be accomplished by using hard wax, by a platinum cylinder connection, or by soldering. This manner of using a mercury reservoir is suggested for other apparatus where either adjustable volume or pressure is required. Development of the Steel Car. H. P. HOFFSTOT. (Railway .Age, vol. 64, No. 9, P. 46I, March I, I918.)--The change from the use of wood to steel in the construction of coal cars in America was extremely gradual in its development, although many years ago a few all-steel cars were built and placed in operation by some of the steel companies. In the early nineties C. T. Schoen commenced making pressed-steel car shapes in his little plant in lower Allegheny, and for years supplied the railroads with pressed-steel centre plates, side bearings, stake pockets, push-pole pockets, etc., for use in connection with the construction of wooden cars. During the same time The Fox Plant in the same locality was furnishing pressed-steel trucks and truck specialties to railroads for use on wooden equipment. About 2895 Mr. Schoen conceived the idea of building steel cars on a large scale. The following year the first steel cars were ordered by the Pittsburgh, Bessemer and Lake Erie Line, and shortly after by the Pittsburgh and Western and the Pittsburgh and Lake Erie. * Communicated by the Manager. ~Physical Review, vol. vi (1915), p. 51. 555