. American engineer and railroad journal . someyears ago made an experiment to settle this much-disputedpoint. Two identical engines and boilers were taken, oneboiler having a dome in the usual position on the barrel, theother having no dome, the steam being taken by a pipe fromthe top of the flat firebox casing. The engine without thedome proved to be decidedly freer from priming than theother. The liberal dimension of 2 ft. between the top of thefirebox and the inside of the casing no doubt contributed tothis satisfactory result.—Mr. G. J. Churchward, before theInstitution of Mechanical Engi
. American engineer and railroad journal . someyears ago made an experiment to settle this much-disputedpoint. Two identical engines and boilers were taken, oneboiler having a dome in the usual position on the barrel, theother having no dome, the steam being taken by a pipe fromthe top of the flat firebox casing. The engine without thedome proved to be decidedly freer from priming than theother. The liberal dimension of 2 ft. between the top of thefirebox and the inside of the casing no doubt contributed tothis satisfactory result.—Mr. G. J. Churchward, before theInstitution of Mechanical Engineers. April, 1906. AMERICAN ENGINEER AND RAILROAD JOURNAL. 159 DOUBLE TAPERED DIES. The illustration shows the double taper used in all Arm-strong dies. As will be seen, the threads at the entrance ofthe die are given a greater taper than the standard. Thisforms a natural and easy lead for the dies, allowing them tostart on the pipe with the least possible pressure and withoutthe use of the lead-screw. By reason of this double taper it. DOUBLE TAPERED DIES. is not necessary to file off the swelling or burr often formedby the cutting tool on the end of a piece of pipe. The advant-ages of the double taper may be illustrated by the fact thatIt is an easy matter for one man alone to start the thread ona 2-in. or even larger pipe without resorting to the dies are made by The Armstrong Manufacturing Com-pany, Bridgeport, Conn. Improved Passenger Traffic Conditions.—The followingfigures, with reference to railways in the United States, shouldprove interesting, in comparison with conditions ten yearsago, namely, 1S94: Railroad mileage in 1903 increased16 4/10% over 1S94; passengers carried in 1903 increased28%% over 1894 ;■ passengers carried one mile in 1903 in-creased 46 3/10% over 1S94; passengers killed in 1903 in-creased 9%% over 1894. From the above it will be noted thatwhile the number of passengers carried increased during thepast ten years 2S%%, the num
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