|CP*2-^. IBiMBl 't Cx^='<U'5L>'>3 ^ A AYEEKLY JOURNAL OF PRACTICAL INFORMATION, ART. SCIENCE, MECHANICS, CHEMISTRY, AND MANUFACTURES. r$3.20 per Annum. NEW YORK, APRIL 14, 1877. Vol. XXXVI.—No, 15.1 L [postage prepaid.] [new series.] J … HARDENS RAILROAD GRADER. IHFBOVED BAILBOAD OBASEB. in which works a large roller. In rear of the latter is a plat- form which is weighted heavily or lightly, as desired. This The accompanying engravings represent a novel device for expeditiously grading railroads. It is mainly intended for is all…
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