The Science record; a compendium of scientific progress and discovery . d stone, whose foundation is six feet thick; theside walls are five feet thick to the spring line, abovewhich the thickness of the wall is four feet; the centrewall is three feet in thickness. All the brickwork andmasonry is set in hydraulic cement. BURGLAR-PROOF SAFE. The latest improvement in burglar-proof safes is to linethe interior with steel rods which revolve easily. Afterdrilling through the outside casing of the safe, the bit willstrike one of these rods and be deflected from its course,It will either not take hol
The Science record; a compendium of scientific progress and discovery . d stone, whose foundation is six feet thick; theside walls are five feet thick to the spring line, abovewhich the thickness of the wall is four feet; the centrewall is three feet in thickness. All the brickwork andmasonry is set in hydraulic cement. BURGLAR-PROOF SAFE. The latest improvement in burglar-proof safes is to linethe interior with steel rods which revolve easily. Afterdrilling through the outside casing of the safe, the bit willstrike one of these rods and be deflected from its course,It will either not take hold or will be broken. MECHANICS AND ENGINEERING. 293 THE RECORDING STEAM-INDICATOR. This is one of those useful devices intended to securesafety for human life and property which ought to be em-ployed wherever steam-boilers are used. A small tube ex-tends from the boiler to the instrument, and the steam-pressure operates the pointer, indicating to the eye theexact pressure in the boiler. A pencil is also connectedwith the pointer, and the pencil writes down upon paper. THE RECORDING STEAM-INDICATOR. the pressure; thus we have a double indicator. A clockcarries the paper, which is marked with the hours and mi-utes, and the instrument is thus made to record the steam-pressure at every moment of time during the twenty-fourhours. If the pressure rises above an established limit,the instrument rings a gong and sounds a general clock requires winding once a week. The paper is re-newed once in three months. Each recorded days workon the paper may be taken off and filed for reference. This 294 SCIENCE RECORD. instrument may be placed on the managers desk, hundredsof feet distant from the boiler, and still give an exact in-dication and record of the management of the boiler. Ittells at a glance whether the engineer is faithful in his du-ties, and records, in black and white, the moment of begin-ning, and the duration of any neglect or inattention on hispart. This is one of the
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