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1573.6
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1592.0
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1594.3
1595.5
1596.6

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2169.5
2171.6
2173.8
2176.0
2178.2
2180.4
2182.5
2184.7.
2186.9
2189.1
2191.3
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2197.9
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2222.3
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2228.9
2231.1
2233.3

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5440.7
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5533.3

7910.2
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7915.0
7917.4
7919.8
7922.2
7924.6
7927.I
7929.5
7931.9
7934.3
7936.7
79391
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7948.7
7951.2
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1602.4

50
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1603-5
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58

58

86o.

CHORD.

Ver. Sin.

Ex. SEC.

Tan.

2104.8

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1573.6 to calculate

2235.6 PAGE Tangent of a 1o curve, Table XVI.

269 to curve from a fixed point, how to locate

108 to two curves on the ground, how to locate

109 Tangential angles and distances explained

50 how to find

57, 58, 64 Thermometer, levelling by

29 Track problems

115 Trackmen's plain rules for finding frog distances

132, 133 tables of turnouts

135, 136 plain rules for laying off turnouts with tape-measure and pins 137 crossings on straight lines and on curves

139 elevation of outer rail

142 instructions how to put in missing stakes on curves with tapemeasure

144 table of curves and spring of rails

143 explanation of the trackmen's tables

144 how to find the degree of a curve .

145, 146 Transit, adjustment of

40 cross-hairs

24 Transitman, duties of

82 Triangles, solution of, two angles and a side given

16 two sides and an angle given

17 three sides given.

18 Triangles, right-angled, solution of

19 Trigonometry, plane.

12 general propositions

15 Turnouts. See Trackmen.

.

Vernier explained.

on transit Versed sines defined

43

of a 1o curve, Table XVI. Vertical curves, to calculate

to project

12 54, 58 269 36 39

TABLES:

Ordinates of a lo curve
For locating terminal curves .
Tangents between curves of contrary flexure
Turnouts, switch-rails straight .

switch-rails curved
Elevation of outer rail on curves
Curves and spring of rails
1. Time of meridian passage of North Star

60 88 89 135 136 142 143 149

PAGE III. Azimuths of North Star, and their natural tangents

150 IV. Roods and perches in decimal parts of an acre

151 V. Decimals of an acre in one chain length of 100 feet, and of various widths

151 VI. Acres, roods, and perches in square feet

152 VII. Circular arcs to radius of 1

152 VIII. Feet in decimals of a mile.

153 IX. Inches reduced to decimal parts of a foot

153 X. Radii and their logarithms, middle ordinates, and deflection distances

155 XI. Squares, cubes, roots, and reciprocals of numbers, from 1 to 1,042 .

161 XII. Logarithms of numbers from 1 to 10,000

179 XIII. Logarithmic sines, cosines, tangents, and cotangents

197 XIV. Natural sines and cosines

243 Natural tangents and cotangents

256 XVI. Chords, versed sines, external secants, and tangents of a 1° curve.

269 XV. Slopes for topography

315 XVII. Rise per mile of various grades .

317

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WIESBACH (JULIUS).

A Manual of Theoretical Mechanics. Translated from the fourth augmented and improved German edition, with an Introduction to the Calculus, by ECKLEY B. CoxE, A.M., Mining Engineer. 1,100 pages and 902 woodcut illustrations. 8vo, cloth

$10 00

FRANCIS (J. B.),

Lowell Hydraulic Experiments. Being a selection from Experi. ments on Hydraulic Motors, on the Flow of Water over Weirs, in Open Canals of Uniform Rectangular Section, and through submerged Orifices and diverging Tubes. Second edition, revised and enlarged, with twenty-three copperplate engravings. 4to, cloth

. 15 00

ROEBLING (J. A.).

Long and Short Span Railway-Bridges. By John A. ROEBLING,
C.E. Illustrated. Imperial folio, cloth

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• 25 00

CLARKE (T. C.).

Description of the Iron Railway Bridge over the Mississippi River at Quincy, Ill. Twenty.one lithographed plans. 4to, cloth

7 50

.

TUNNER (P.).

A Treatise on Roll-Turning for the Manufacture of Iron. By PETER TUNNER. Translated and adapted by John B. PEARSE, of the Pennsylvania Steel Works. With numerous engravings, woodcuts, and folio atlas of plates

10 00

GILLMORE (Gen. Q. A.).

Practical Treatise on the Construction of Roads, Streets, and

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