Gas.

How to Manage Gas, by F. Wilkins, C.E., second
edition, 12mo, sewed

Gas Works.

Instructions for the Management of Gas Works, by
W. C. Holmes, Engineer, 8vo, cloth

Geology.

Manual of Geology, treating of the Principles of the Science, with special reference to American Geological History, by Jas. D. Dana, illustrated by over 1100 figures, and a chart of the World, 8vo, cloth Geometry.

Practical Geometry and Engineering Drawing: a Course of Descriptive Geometry adapted to the Requirements of the Engineering Draughtsman, including the determination of cast shadows and Isometric Projection, each chapter being followed by numerous examples, to which are added rules for shading Shadelining, etc., together with practical instructions as to the Lining, Colouring, Printing, and general treatment of Engineering Drawings, with a chapter on drawing Instruments, by George S. Clarke, Lieut. R.E., Instructor in Mechanical Drawing, Royal Indian Engineering College, Coopers Hill, 20 plates, 4to., cloth Gunner's Pocket-Book.

Bridges' Gunner's Pocket-Book, compiled by Captain
T. W. Bridges, H.P. Royal Artillery, crown 32m0,
roan, Is.; or morocco

4

25 c

15

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"Now-a-days nearly every profession has its special 'pocket-book,' and why not the artillerist? So thought Capt. Bridges: hence this little book, which originated in a few tablets he was in the habit of carrying in his pouch, and which, amended and enlarged, he has now published in a waistcoat-pocket form, consisting of more than sixty pages of useful information to the gunner, whether volunteer or regular. Here we find rules for finding the distance of hostile batteries, and tables giving the range of guns for various degrees of elevation; the drills for the different service guns, and various other items, from the rations for horses to the trumpet-call for the soldier's mess."-English Mechanic.

Gunnery.

Tables of Remaining Velocity, Time of Flight, and
Energy of various Projectiles, calculated from the
results of experiments made with the Bashforth Crono-
graph, 1865-1870, 8vo, sewed

Hat-Making.

A Treatise on Hat-Making and Felting, including a
full Exposition of the Singular Properties of Fur,
Wool, and Hair, by John Thomson (a practical Hatter),
cuts, 8vo, cloth

2 6

36

Handrailing.

Heat.

Handrailing cut square to the Plank, without a Falling
Mould, as discovered and taught at the Mechanics'
Institution, Liverpool, by John Jones, Staircase Builder,
containing seven plates, with full instructions for
working them, fol. boards

Heat as a source of Power, with applications of general
principles to the construction of Steam Generators, by
W. P. Trowbridge, 8vo, cloth

Hints to Young Engineers.

By J. Wilson, A.I.C.E., Principal of the Crystal Palace
School of Engineering, 12mo, sewed

Hot-Water Apparatus.

The Engineers' Practical Guide for fixing Hot-Water
Apparatus, and Warming Greenhouses and Buildings,
by John Eldridge, Hot-Water Engineer, illustrated
with plans and sections, second edition, crown 8vo,

sewed

Hot-Houses.

A Practical Treatise on the Construction, Heating, and
Ventilating of Hot-Houses, including Conservatories,
Green-Houses, Graperies, and other kinds of Horticul-
tural Structures, with practical directions for their Ma-
nagement in regard to Light, Heat, and Air, by Robt.
B. Leuchars, numerous illustrations, crown 8vo, cloth

Hydraulics of Great Rivers.

Observations and Surveys on the Largest Rivers of the
World, by J. J. Révy, Civil Engineer, one volume,
imp. 4to, cloth, with eight large plates and charts

CONTENTS:

CHAPTER I.

60

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06

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76

£220

GENERAL OBSERVATIONS: the Paraná, the Uruguay, and the La Plata Estuary. Ordinary mode of Proceeding; Fall of Rivers; Floats for Currents, single and double; Formulæ of great Mathematicians; Coefficients to correct erring Formulæ ; Accurate Section of Great Rivers readily obtained; Current Observations difficult; Floats deserve no confidence. The great Mississippi Surveys.

CHAPTER II.

MODE OF SURVEY ADOPTED: Detailed description. Section of River: Rosario Section; Instruments. Currents: Special Apparatus; Current Meter; Improvements; Difficulties of great Depth; Design of New Apparatus; Current Integrator; Correct Observations practicable to any Depth; Accuracy. CHAPTER III.

THE LA PLATA.

ESTUARY: Dimensions, Width, Depth, Channels; Changes; Deposit; Formation of Banks, Islands, Channels. Tides: Wave of the South Atlantic; Violent Disturbances; Diagrams; Contention between Great Rivers and Tidal Wave. Current Observations: Current Curve; Currents at various Depths. Mean Current: Integrator; Results; Check Trials; Summary of Mean; Cause of variety of Currents. Inclination: Estuary; Tidal Wave; from Flood to Ebb; during Low Water; Interference of Rivers.

CHAPTER IV.

THE PARANA DE LAS PALMAS.

THE RIVER: Charts, Delta, Navigation, Embouchure. Diary of Observa tions: Currents; Mean, Surface, Bottom; Night and Day Observations; Rise and Fall at Section; Results of Currents; Soundings; Tables, Analysis of Tides: Diagrams of Systems of Waves; True Outline of Tidal Wave; Dimensions. Analysis of Inclination: Measure of Power of Wave; Effective and Imaginary Inclination; Effect of Tributaries; Artificial Channels. Analysis of Currents: Current Curve; Velocity at Surface and three feet below; Maximum Current; Mean Current; Corresponding Surface and Bottom Currents; Current Curve across Section.

CHAPTER V.

THE PARANA.

THE RIVER: Expedition up River; Navigation; Channel of Guazú-branch; Scenery; Laguna of San Pedro; Rosario; Punta Gorda; the Delta com mences here; Formation of the Plains of South America; D'Orbigny's and Darwin's Opinion; Pampas Deposit; Formation of Toscas; Ancient Coral Reefs; Paraná; La Paz; Esquina; Alexandra Colony; Corrientes; Source and Drainage Area of River. The Rosario Section: Currents. Analysis of Observations: Section of River; its Outline reproduced by Outline of Surface Currents in 13 seconds' time; Surface Currents of Uruguay reproduce corresponding Depths in 5 seconds; the Law governing Surface Currents; Effective Inclination. Analysis of Depth and Surface Currents. Analysis of Inclination: Inclination of Paraná and of Palmas; Gradients of a river; Channel of Paraná at Section on a slight bend determined by Centres. Analysis of Section: Channel Depth, Sectional Areas; Currents; Surface Movement of River; Flood Volume; Exceptional Rises.

CHAPTER VI.

THE URUGUAY.

FROM RIVER TO RIVER: the Pavon Channel; the Ibicuy River; Dimensions; Currents. The River: the Lake its Estuary; Delta; Turbidity of Paraná and Uruguay waters; Port of Salto; Navigation; the Falls; Extraordinary Fluctuations of River; Periodical Rises; Floods; Low Water;

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Drainage Area. Salto Section: Currents; Tables; Dimensions of River; Sectional Areas. Analysis of Currents: Surface Movement of River. Analysis of Inclination: River's Inclination 5 times that of the Paraná; Fall during Periodical Rises. Centres of Gravity: Close Agreement of Centres of Section and of Currents; their Position.

APPENDIX.

The improved Current Meter and its Application; Description; Details; Modes of Observation at Fixed Levels; Integration of Currents; Trials to determine Values of Equation; Algebraic expression; Examples; Geometrical Solution of Problems.

Hydraulics.

Manual of Hydrology, containing Hydraulic and other
Tables, rivers, flow of water, springs, wells, and per-
colation, tides, estuaries and tidal rivers, rainfall, and
evaporation, by Nathaniel Beardmore, C.E., plates,
8vo, cloth

Hydraulics.

Lowell Hydraulic Experiments; being a Selection from Experiments on Hydraulic Motors, on the flow of Water over Weirs, in open Canals, of uniform Rectangular Sections, and through Submerged Orifices and Diverging Tubes, made at Lowell, Massachusetts, by James B. Francis, Civil Engineer, second edition, revised and enlarged, with many New Experiments, and Additional Illustrations, plates, 4to, cloth Hydraulics.

Description of the Differential Expansive Pumping
Engine, with useful notes by Henry Davey, C.E., plates,
royal 8vo, sewed

Hydraulics.

Practical Hydraulics: a Series of Rules and Tables
for the use of Engineers, etc., etc., by Thomas Box,
third edition, numerous plates, post 8vo, cloth

CONTENTS:

Tables and Formulæ of the Theoretical Discharge of Water by round apertures of various diameters, and under different heads of water pres

sure.

Of the Actual Discharge of short Tubes of various diameters, with square edges, and under different heads of water pressure, being 8-10ths of the theoretical discharge. For bends in Water pipes, showing the loss of head due to change of direction by one bend of 90°. For quick bends.

24 0

£3 13 6

I 6

5 0

Of the Heights of Jets with different heads.

Of the Discharge of Jets with different
heads.

Of the Discharge of Water over
Weirs.

Of the Discharge of Overflow Pipes

for Tanks, etc. For open Channels, Canals, and Rivers. For the Discharge of ditto.

Of the Strength of Water Pipes.

Etc. etc. etc.

Hydraulics.

Tredgold's Tracts on Hydraulics, containing Smeaton's
Experimental Papers on the power of Water and
Wind to turn Mills, etc., Venturi's Experiments on
the Motion of Fluids, and Dr. Young's Summary of
Practical Hydraulics, plates, royal 8vo, boards

Hydraulic Engineering.

Prize Essay on the Encroachment of the Sea between
the River Mersey and the Bristol Channel, being an
Essay which obtained the Prize of the National
Eistedfodd, held at Chester, 1866; by J. E. Thomas,
8vo, sewed

Hydraulic Presses.

Experiments on the Friction of the Leather Collars
in Hydraulic Presses; conducted by John Hick, C.E.,
plate, 8vo, sewed

Hydraulic Tables.

Office Hydraulic Tables, for the use of Engineers
engaged in Waterworks, giving the Discharge and
Dimensions of Rivers, Channels, and Pipes, by J.
Neville, on a large folio sheet

Illumination.

Handbook of Alphabets, in three parts. Part 1, Illu-
minated initial letters from the 6th to the 18th cen-
tury, containing 363 examples. Part 2, Manuscript,
missal, and ornamental alphabets, from the Christian
era to the 17th century, comprising 155 examples.
Part 3, plain and ornamental alphabets, with 36
examples, the whole printed in gold and colours, in
one vol., royal 8vo, oblong, bound in cloth

Indicator.

The Indicator Diagram Practically Considered, by
N. P. Burgh, Engineer, numerous illustrations, fourth
edition, crown 8vo, cloth

66

"This volume possesses one feature which renders it almost unique; this feature is the mode in which it is illustrated. It is not difficult to take a diagram if the instrument is once set, and the setting with stationary engines is occasionally easy enough, but circumstances continually arise under which the young engineer is completely at a loss as to how to obtain a diagram. All uncertainty will be removed by referring to the book under consideration; here we have drawings of the arrangements to be adopted under every conceivable circumstance, drawings, we may add, illustrating the practice of the best engineers of the day."—Engineer.

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