A Manual of the Principle Instruments Used in American Engineering and Surveying, Manufactured by W. & L.E. Gurley

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W. & L.E. Gurley, 1908 - Surveying - 470 pages
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Page 450 - SCHUMANN, F. A Manual of Heating and Ventilation in its Practical Application, for the use of Engineers and Architects. Embracing a Series of Tables and Formulae for Dimensions of Heating, Flow and Return Pipes for Steam and Hot-water Boilers, Flues, etc. 12mo, illustrated, full roan $1 .50 SCHWEIZER, V.
Page 451 - WA Key to the Solar Compass, and Surveyor's Companion. Comprising all the rules necessary for use in the field ; also description of the Linear Surveys and Public Land System of the United States, Notes on the Barometer, Suggestions for an Outfit for a Survey of Four Months, etc.
Page 446 - Rules of Geometry are familiarly explained; the Practical Problems are arranged from the most simple to the more complex, and in their description technicalities are avoided as much as possible.
Page 448 - ADAMS, JW Sewers and Drains for Populous Districts. Embracing Rules and Formulas for the dimensions and construction of works of Sanitary Engineers.
Page 108 - Pig. 1, in the place of the needle, and in fact operates as its substitute in the field. It consists mainly of three arcs of circles, by which can be set off the latitude of a place, the declination of the sun, and the hour of the day. These arcs, designated in the cut by the letters a, b, and c, are therefore termed the latitude, the declination, and the hour arcs respectively.
Page 86 - ... the lower equatorial line, or, in other words, as long as the sun continues to rise in the heavens. When the sun reaches the meridian the image will remain stationary in altitude for an instant, and will then begin to rise on the plate.
Page 425 - Anemometer consists of a series of vanes, which revolve with the action of the air-current, the number of revolutions, or numbers proportioned to the revolutions, being registered by a pointer on the face of a dial, forming part of the instrument itself. An observer has only to record the position of the several indices at the first observation (by writing the lower of the two figures on the respective circles, between which the index points, in their proper order), and deduct the amount from their...
Page 448 - FANNING, JT A Practical Treatise on Hydraulic and Water-supply Engineering. Relating to the Hydrology, Hydrodynamics and Practical Construction of Water-works in North America.
Page 83 - TO COMPUTE THE DECLINATION Suppose the corrected declination is desired for the different hours of February 15, 1905, at Troy, NY The latitude is 42 44'. The longitude is practically five hours ; so that the declination given in the Ephemeris for apparent noon of that day at Greenwich would be that for 7 AM at Troy, or five hours earlier. Note carefully the algebraic signs. The declination is South or minus. Its hourly difference is plus. The refraction always is plus. Hence we use the algebraic...
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