A TEXT-BOOK OF RADAR. A collective work by the staff of the Radiophysics Laboratory, Council for Scientific and Industrial Research, Australia. Edited by E. G. Bowen. Cambridge University Press, New York, N. Y., 1954. Second edition. 617 pages. $8.50. The U. S. publishers of the second edition of this work have sent a copy to SURVEYING AND MAPPING for review, recognizing the increasing uses that surveyors are making of radar and other radio instruments. This text, however, is not a book that is suited to the needs of the surveyor who seeks an introduction either to the applications or to the theory of electronics as it relates to surveying. Despite the statement on its dust jacket that the book includes material on the application of radar aids to surveying, this material consists of but a very few pages and is chiefly in the nature of a review intended to acquaint the reader with one of the many applications of radar. It must be said that the book's general purpose, to inform physicists and engineers of latest micro-wave developments, did not permit its authors to elaborate on the special subject of survey instruments. But the very brevity of its discussion of this new phase of surveying serves to emphasize that there is yet no comprehensive work on the subject, though the need is growing. Already coming into wider use are such instruments as radar altitude and ranging devices, together with radio hyperbolic positioning systems. We may expect that development of these and other instruments will parallel that of the marine echo sounder. Echo sounders, at first bulky and expensively complex, are now manufactured so inexpensively that they are be coming standard equipment for yachtsmen and fishermen. Although the sounding lead will not be joined in retirement by the surveyor's tape this year or next, who would predict that a precise and easily portable distance finder will not be in use for surveying before the decade is out? Even though the practising surveyor undoubtedly will make use of electronic instruments in years to come, he should not have to acquire a mastery of electronics. He will not need a designer's knowledge of the circuits and elements of his new devices. He should have, however, a working understanding of them. Just as he is comfortably familiar with the behavior of the lenses of his transit, so he should become acquainted with the nature of resistors, capacitors, coils, and tubes, and know generally how they are used to control and modify the radio-frequency oscillations that are basic to electronics. A qualitative understanding of these matters is not hard to come by and provides the surveyor enough comprehension of the workings of his instrument to assure him he still is in com mand of his measurements. This assurance, essential for all types of professional survey work, need not be despaired of even in the face of apparently formidable equipments, provided that properly written texts become available. Books such as A Text-book of Radar, written for the man who already knows much of the theory and applications of electronics, are of little help to the surveyor previously unlettered in the subject. That a much more helpful work could be written seems as certain as would be the desire of a great many surveyors to add such a work to their professional libraries. ROBERT H. RANDALL, JR. U. S. Navy Hydrographic Office Non-Warping Drawing and Photographic Papers A Swiss manufacturer* now has on the mar- by the insertion; it keeps its fine gloss, its ket high quality aluminum-inserted drawing and photographic papers which, it is claimed, provide high stability against warpage. The quality of the drawing paper is not affected *Elsaesser Technical Papers Ltd., Kirchberg/ Berne, Switzerland. ures. permanent whiteness, and its resistance to erasThe drawing plates are suitable for all kinds of work which has to be accurate as to measurements and entails fine drawing. The photographic papers are furnished in the form of silver bromide contrast papers containing inserted aluminum sheets. MAP INFORMATION This department was inaugurated for the purpose of bringing to the attention of the members information pertaining to the availability of maps, surveys, etc., with particular emphasis on how such material can be procured. It is believed that through an interchange and dissemination of such information maximum benefits will accrue to the surveying and mapping profession. -EDITOR THE Topographic Maps U. S. GEOLOGICAL SURVEY MAPS HE FOLLOWING quadrangle maps were published by the U. S. Geological Survey between June 1 and August 31, 1954. The list includes newly compiled maps; revised maps on which contours and drainage usually are unchanged but the works of man are brought up to date; and series-converted maps which are 15-minute maps produced from four 72-minute maps of the same area. The maps are new unless otherwise designated by numerical superscript. The quadrangle name (in capital letters) is followed by the name of the county (in upper- and lower-case letters) that contains the place or feature for which the quadrangle is named. All maps are available with or without the green overprint that indicates woodland. These maps show the shape and elevation of the land surface (represented by contour lines, printed in brown-except those marked with letter P which are planimetric); water features (in blue); works of man, including cities, towns, and scattered habitations, schools, churches, railroads, roads, boundaries, and place and feature names (in black); and woodland areas (in green). Principal roads are shown by a red overprint. In areas that have been covered by General Land Office Surveys, township and section lines are shown. The State rectangular coordinate systems are indicated in the margins of the maps. An information folder further describing topographic maps and symbols is available on request. Standard quadrangle maps may be obtained for 20 cents per copy. A discount of 20 percent is allowed on orders amounting to $10 or more at the retail price. Orders should be addressed to the U. S. Geological Survey, Washington 25, D. C. (or Denver 15, Colo., for maps of areas west of the Mississippi River). * Indicates 15-minute quadrangle; all others are 72-minute quadrangles. 1 Indicates a revised map 2 Indicates a series-converted map. + Indicates availability in either a contour or a shaded-relief edition. Indicates preliminary black and white edition. dicial Division PETERSBURG (A-4)*-First Ju dicial Division PETERSBURG (B-5)*-First Judicial Division SEWARD (A-1)*-Third Judicial Division SEWARD (A-2)*-Third Judicial Division SEWARD (A-4)*-Third Judicial Division SEWARD (A-6)*-Third Judicial Division SEWARD (A-7)*-Third Judicial Division SEWARD (A-8)*-Third Judicial Division SEWARD (B-1)*-Third Judicial Division SEWARD (B-7)*-Third Judicial Division SEWARD (B-8)*-Third Judicial Division Arizona-Utah DINNE MESA NE-Apache IDINNE MESA NW-Apache PASTORA PEAK NW-Apache SETSILTSO SPRINGS 2 NEApache Arkansas HENRICO*1-Desha INDIAN BAY*1-Monroe California ANTIOCH SOUTH-Contra Costa BIRDS LANDING-Solano BOULDIN ISLAND-San Joaquin BRUSH LAKEL-Stanislaus CANOGA PARK Los Angeles CLAY Sacramento CROWS LANDING1-Stanislaus DUCOR-Tulare DUNCAN PEAK-Placer GAVIOTA-Santa Barbara GREEK STORE-Placer HALF MOON BAY-San Mateo JERSEY ISLAND-Contra Costa NEWMAN Stanislaus POINT CONCEPTION Santa POWAY VALLEY-San Diego RICHGROVEL Tulare ROMOLAND-Riverside SALIDAStanislaus SAN LUIS CREEK-Merced SLOUGHHOUSE-Sacramento TRINIDAD*1 -Humboldt WATERLOOL San Joaquin WESTLEY-Stanislaus WINTERS-Yolo KREYBILL-Bent RIO BLANCO-Rio Blanco GLEN ELDER SOUTH-Mitchell MANHATTAN 2 Riley WACONDA SPRINGS-Mitchell WILLARD-Shawnee Kentucky BEDFORD-Trimble BEECH GROVE-Webster BRODHEAD-Rockcastle CAMPBELLSBURG-Henry CAMPTON-Wolfe CARDWELL-Washington CENTRAL CITY EAST-Muhlenberg CENTRAL CITY WEST-Muhlenberg CURDSVILLE-Daviess CUSTER Breckinridge DELAWARE-Daviess DRAKESBORO-Muhlenberg FARMERS-Rowan FREEDOM-Barren GLASGOW SOUTH-Barren GRACEY-Christian HALEYS MILL-Christian HARDINSBURG-Breckinridge HIBERNIA-Taylor HOLLY HILL-McCreary HUDGINS--Green IRVINE-Estill KINGSWOOD-Breckinridge LEBANON EAST-Marion LODIBURG-Breckinridge MADISONVILLE EAST-Hopkins MCDANIELS-Breckinridge MCKEE Jackson MILLPORT-Muhlenberg MOBERLY-Madison MOOREFIELD-Nicholas MOUNT VERNON-Rockcastle NORTONVILLE-Hopkins PANTHER-Daviess QUALITY-Butler ROCHESTER-Butler SALOMA-Taylor SALT LICK-Bath SAWYER-McCreary SOUTH HILL-Butler BLUFF 3 SE-San Juan BLUFF 3 SW-San Juan CARLISLE 2 NE-San Juan CARLISLE 2 SE--San Juan CIRCLE CLIFFS 4 NE-Garfield CIRCLE CLIFFS 4 NW-Garfield #CIRCLE CLIFFS 4 SW-Garfield DRAPER-Salt Lake ELK RIDGE 3 NW-San Juan ELK RIDGE 3 SW-San Juan LOA 1 NE-Wayne LOA 1 SE-Wayne LOA 4 NE-Wayne ‡MOAB 3 NE-Grand MOAB 3 NW-Grand MOAB 3 SE-Grand MOAB 3 SW-Grand MOUNT ELLEN 4 NW-Wayne ‡MOUNT ELLEN 4 SW-Garfield MOUNT PENNELL 1 NE-Garfield Mont NOTOM 3 NE-Wayne NOTOM 3 NW-Wayne NOTOM 3 SE-Garfield NOTOM 3 SW-Garfield NOTOM 4 NE-Wayne LOOKOUT MOUNTAIN-Crook Pennsylvania DOYLESTOWN -Bucks FAIRFIELD*2. Adams GETTYSBURG*2- Adams IRON SPRINGS -Adams PERKIOMENVILLE gomery Puerto Rico ARECIBOLArecibo BARRANQUITAS1 NOTOM 4 Barranqui tas field Rhode Island Washing QUONOCHONTAUG1 ton South Dakota COLUMBIA-Brown FAITH NW-Perkins NE-Emery SE-Garfield CREEK 1 NOTOM 4 NW-Wayne NOTOM 4 SW-Garfield ORANGE CLIFFS 3 SW-Gar ISTINKING SPRING ISTINKING SPRING CREEK 1 NW-Emery ISTINKING SPRING CREEK |