. Railway mechanical engineer . d. STEP-LADDER FOR SLEEPING CARS Etching on Gl.^ss.—A simple method of etching glass is tocoat it with melted candle-grease, and draw the pattern to beetched in the wax with a sharp needle point. Then expose theglass to the action of vapor of hydrofluoric acid, generated byacting on fluorspar with hydrochloric acid, and gently gas must be generated in a lead vessel, as it attacks mostsubstances. It is very poisonous, and, therefore, care must betaken not to inhale it.—.■tn-cilca)! Machinist. The engraving shows a light step-ladder which has met witlicon
. Railway mechanical engineer . d. STEP-LADDER FOR SLEEPING CARS Etching on Gl.^ss.—A simple method of etching glass is tocoat it with melted candle-grease, and draw the pattern to beetched in the wax with a sharp needle point. Then expose theglass to the action of vapor of hydrofluoric acid, generated byacting on fluorspar with hydrochloric acid, and gently gas must be generated in a lead vessel, as it attacks mostsubstances. It is very poisonous, and, therefore, care must betaken not to inhale it.—.■tn-cilca)! Machinist. The engraving shows a light step-ladder which has met witliconsiderable success as an upper berth ladder for sleeping carson the Canadian Northern. The main frame is made of chan-nels, the folding legs are angles, the treads are covered withcarpet and the whole ladder combines lightness with method of securing the top of the ladder to the berth in-sures against slipping and possible accident therefrom. 1 helocking arrangement, details of which are shown in the Arrangement I . S . , z of Lock. A 1- 1x1,16 //TTTl W-ishre ^//.■/4 • Bolt- Mefhod of Fasfening^>>// -j^j,; ^.lobbingfo Cross Tie.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
