. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . st of 13-in. steel channels. Thetank is of the water-bottom type, withcapacity for 7,000 gallons of water and12 tons of coal. The principal dimensionsof these engines are presented in theaccompanying table. Cylinders, 22 x 30 ins.\ alves, balanced —Type, wagon top; material, steel; diam- Development of the Boring Tool. The first boring tool used was someof awl. I hat description used during the infancy of civil-ization for awls are shown in built 1700 B. C. Pliny stat
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . st of 13-in. steel channels. Thetank is of the water-bottom type, withcapacity for 7,000 gallons of water and12 tons of coal. The principal dimensionsof these engines are presented in theaccompanying table. Cylinders, 22 x 30 ins.\ alves, balanced —Type, wagon top; material, steel; diam- Development of the Boring Tool. The first boring tool used was someof awl. I hat description used during the infancy of civil-ization for awls are shown in built 1700 B. C. Pliny statesthai the gimlet was invented by Dae-dalus 1240 B. C. It was destitute of ascrew point, but it may have had ahollow pod and a cross head forming ahandle. The screw point was addedto the gimlet in course of time, andwithin our own recollection the twistedshank which makes it point was taken from the augerproper, which may be called a magni-fied gimlet, now that their specific fea-tures have become so closely assimi-lated in form and function. The auger was a Greek tool. From. HEAVY CONSOLIDATION TYPE FOR THE BOSTON & MAINE. H. Bartlett, General Superintendent of Machinery Department. The boiler is of the extended wagon-top type, with a radially-stayed wide fire-box. The boiler center is placed 9 ft. tins. above the rails, while the maximumheight over all is limited to 14 ft. 6 this restriction there is but littlespace available for the dome, and it isformed of a single piece of flanged longitudinal seams in the barrel havediamond welt strips. The fire-box isstayed entirely by flexible bolts, with theexception of the radial stays which sup-port the crown. The box is providedwith a brick arch supported on watertubes. A self-cleaning front end is used,without spark hopper. The stack is 16ins. in diameter, and has an internal ad-justable extension. The spark arresterconsists of a perforated plate. The frames are of steel, each cast inone pi
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