. The Street railway journal . adly crystallized rails provethat the machine is particularly adapted for cutting rails whichhave been exposed to the elements for considerable time. The Q. & C. Company has also recently placed on the market anew automatic saw-grinder, which is very simple in constructionand positive in action. It is shown herewith. A slotted disccrank is marked showing where to place the connecting rod inorder to get the proper throw to grind saws furnished with the C. machines. An extra emery wheel is furnished .with thisgrinder to grind the top of the teeth of the saw, gi
. The Street railway journal . adly crystallized rails provethat the machine is particularly adapted for cutting rails whichhave been exposed to the elements for considerable time. The Q. & C. Company has also recently placed on the market anew automatic saw-grinder, which is very simple in constructionand positive in action. It is shown herewith. A slotted disccrank is marked showing where to place the connecting rod inorder to get the proper throw to grind saws furnished with the C. machines. An extra emery wheel is furnished .with thisgrinder to grind the top of the teeth of the saw, giving them theproper clearance. SAW GRINDER diameter, and were designed to each deliver 30,000 cu. ft. of airper minute, when operated at 175 and to require an ex-penditure of about 7 each for their operation under ordinaryatmospheric conditions. At one-half the speed the power expend-irure would be about 1 Both of those values will naturallywary with the density of the air and the existing temperatures. Ventilation of the Boston Subway The original designs of the Boston Transit Commission forventilating the Boston Subway contemplated the introduction ofelectrically driven fans at suitable points along the route. Fourof these have already been constructed and installed by the B. Company, of Boston; two near West Street, and twobetween Hollis and Eliot Streets. The former location is practi-cally midway between the Boylston and Park Street entrances, ateach of which there is ample opportunity for the free ingress ofair. The space coming under the control of the fans at this pointis about 1,050,000 cu. ft. The Hollis and Eliot Street section con-tains about 900,000 cu. ft. The fans were, in each case, designed to have a capacity equiva-lent to an air change in each section once in about fifteen the accompanying engraving is shown the general arrangement Struct RaiXWJI SIDE ELEVATION OF BOSTON SUBWAY FAN within and without the su
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
