Description
International Textbook Company, Published 1940. Hardcover, vi, 93, 42, 85 pp.; 20 cm; illustrated with black-and-white line engravings, diagrams and tables throughout, with one folding plate.
Rare, out-of-print & unusual books · Since 1997
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Catalog notes
Condition & notes
In Very Good condition, no dust jacket. Black pebble-grained cloth, blind-stamped International Library panel and International Textbook Company monogram on front cover, blind-stamped publisher's panel at foot, gilt lettering on spine, volume number at foot of spine rubbed, reading from the foot upward as in all volumes of the series. Mild shelf and edge wear, with some scuffing to front cover. Binding tight. Green and cream marbled endpapers, blue-stained page edges. Mild toning, with light scattered spotting to the title leaf. Otherwise unmarked. Volume 322C in the bound series issued by International Textbook Company, the publishing arm of the International Correspondence Schools of Scranton, Pennsylvania. ICS grew out of a mine-safety question-and-answer column run by Thomas J. Foster in the Colliery Engineer and Metal Miner and enrolled its first class of 500 miners in 1891; cumulative enrollment reached four million by 1930, making it the most successful correspondence school in American history. The bound volumes gathered the loose serial-numbered Instruction Papers into permanent form, this one comprising Stadia and Plane-Table Surveying (Serial 5221, Edition 1), Topographic Surveying, and Hydrographic Surveying, by the I.C.S. Staff in collaboration with George D. Whitmore, Chief of Surveys at the Tennessee Valley Authority. The first section is the stadia method, the quick way to get moderate distances when high accuracy is not required: the principle, instrument constants, formulas, the stadia reduction table and the Beaman arc, then field operations, the determination of rod interval, methods of finding the inclination of the line of sight, observations taken with and without the stadia arc, elevations when the middle hair is set at a foot-mark, the stepping method, the accuracy to be expected, transit-stadia surveys for locating topography with typical field notes, and indirect leveling by stadia. Plane-table work follows, the outfit itself with the Coast-Survey, Johnson and traverse tables and the seasoned pine board dovetailed against warping, the alidade, then orienting the table, locating points by direction and distance and by intersection, plotting the position of the table by Lehmann's coast-survey method, control, field methods for locating topography, and a closing stadia reduction table. Topographic Surveying is the short middle section, covering methods of control and of locating contours, the side-shot method by transit and stadia and by plane table, the cross-section method by transit and level, by hand level and by slope level, and a brief treatment of aerial topographic surveying. Hydrographic Surveying is the most unusual of the three and takes the work onto the water: the survey of a shoreline by transverse surveying and triangulation, sounding and gauges, then a full account of the sextant, the law of reflection, its theory, vernier and adjustments, and why it suits a boat where a fixed instrument will not serve. Then the locating of soundings by ranges, sounding ranges and ranges marked by buoys, range poles and targets, and the several methods of fixing a sounding, by time intervals, by one angle measured on shore, by two angles measured simultaneously on shore or in the boat, by transit and stadia, and by a fixed line marked by wire or rope. Forms for sounding notes, the platting of soundings with the three-arm protractor and the tracing-paper method, hydrographic maps and charts, and the measurement of volume follow, with the capacity of a lake or reservoir and of a valley or basin for water storage. The folding plate is Fig. 36, a navigation chart of a harbor entrance, soundings in feet at mean low water, lines of equal depth at six-foot intervals to eighteen feet, buoys set along the eighteen-foot contour to mark the limits of the channel, triangulation points, a bar, a wreck, high and low water lines, and a gridded town along the shore with its church, windmill, lighthouse and wharf; the facing text works through how each sounding was fixed, the nearer ones by intersecting transit lines observed from shore and those farther out by sextant angles on three fixed points, the church, the lighthouse and the windmill. The coastal methods at the end reach current practice for 1939, echo sounding, radio-acoustic ranging in which a bomb is exploded and the interval to the receipt of radio signals is multiplied by the velocity of sound in the water, and star-control echo sounding with sextant observations on four stars at dawn or dusk. The hydrographic section refers the student back to Mapping, Parts 1 and 2, for the drawing of the resulting charts. Stadia and Plane-Table Surveying carries the 1940 copyright, Topographic Surveying the 1931, Hydrographic Surveying the 1939, with no periodic-review notice or later edition date. Printed by The Haddon Craftsmen of Scranton, printer's key 93819 at foot of the copyright page; the folding plate is signed BB 322B-787-3, struck for the earlier 322B compilation and carried over into this one. Contents: Stadia and Plane-Table Surveying: Stadia Surveying; Determination of Distances by Stadia; Field Operations in Stadia Work; Practical Considerations in Stadia Work; Making Observations and Computing Results; Accuracy of Stadia Work; Transit-Stadia Surveys for Locating Topography; Indirect Leveling by Stadia; Plane-Table Surveying; Outfit for Plane-Table Work; Surveying With Plane Table; Locating Points From Plane Table; Plotting Position of Plane Table; Control for Plane-Table Surveys; Field Methods for Locating Topography; Accuracy of Plane-Table Work; Stadia Reduction Table. Topographic Surveying: General Methods; Locating Topographic Features; Side-Shot Method; Cross-Section Method; Aerial Topographic Surveying. Hydrographic Surveying: Survey of Outline of a Body of Water; Survey of a Submerged Area; Sounding; Gauges; The Sextant; Locating Soundings; Ranges; Range Signals; Methods of Locating Soundings; Forms for Sounding Notes; Platting the Soundings; Hydrographic Maps and Charts; Measurement of Volume; Capacity of a Lake or Reservoir; Capacity of a Valley or Basin for Water Storage; Methods for Hydrographic Surveying Along Coast; Methods for Sounding; Methods for Locating Positions of Soundings.