A Manual of the Principal Instruments Used in American Engineering and Surveying |
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Common terms and phrases
5-inch needle adjustment Alidade angles ball-spindle Bow-pen Box of Leads Boxwood Scale bubble chain clamp and tangent clamp-screw clinometer compass-circle cross-wire Current-Meter diameter Drawing-Pen edge Engineers extension tripod eyepiece feet long fixed needle point folding sights foot furnished German silver graduated to feet Hairspring Dividers half circle half degrees horizontal inches inches long inches wide instrument ivory handle latitude leather lengthening bar level on telescope leveling-head leveling-screws mahogany main socket meridian metal Meter Morocco object-glass slide oval rings pen and pencil pencil points Plain Dividers Plane-Table plate plummet Pocket Railroad Compass points and lengthening POST PRICE Protractor rack and pinion shown side Solar Attachment Solar Compass spindle stadia wires staff mountings Steel Tape steel wire Steelspring surface Surveyors tangent movement tangent screw tangent to telescope tele telescope and clamp telescope axis Telescopic Sight TROY tube verniers to limb vertical arc vertical circle Y-Level zero
Popular passages
Page 430 - 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 431 - Tables for Field Engineers. Designed for use in the field. Tables containing all the functions of a one degree curve, from which a corresponding one can be found for any required degree. Also, Tables of Natural Sines and Tangents.
Page 430 - 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 426 - 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 428 - ADAMS, JW Sewers and Drains for Populous Districts. Embracing Rules and Formulas for the dimensions and construction of works of Sanitary Engineers.
Page 422 - Easy Guide to the Knowledge of the Constellations. Showing in 12 Maps the position oi the principal Star-Groups night after night throughout the year. With Introduction and a separate Explanation of each Map. True for every Year.
Page 65 - When the Solar Attachment is accurately adjusted and the transit plates made perfectly horizontal, the latitude of the place and the declination of the sun for the given day and hour being also set off on their respective arcs, and the instrument set approximately north by the magnetic needle, the image of the sun cannot be brought between the equatorial lines until the polar axis is placed in the plane of the meridian of the place, or in a position parallel with the axis of the earth. The slightest...
Page 75 - 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 sum, thus : — S 12° 47' 57".5 is the tabular declination for 7 AM 51 ".3 Sub. hr. dif. — 12° 47
Page 407 - 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 165 - ... of the eye-piece of a telescope, in which the foci of the object and eyeglasses are not brought precisely upon the crosswires and object ; in such a case the wires will appear to move over the surface, and the observation will be liable to inaccuracy. In all instances the wires and object should be brought into view so perfectly that the...