VVM. H. H. EMIENT & so N, //WDUSTF/AL WORKS, - - Philadelphia.

Milling Machines.

Isaac H. Shearman................................... ... Philadelphia, Pa............. See Page 80
Phelps & Sanger........................................... Cleveland, O................... “, 120
Wm. Sellers & Co . . Philadelphia, Pa...... ... to $ to $ to & 6 64
Mineral Door Knobs. --
Romer & Co.................. Newark, N. J.................. See Page 204
Mining Engines. - .
J. S. Mundy.................................................. Newark, N. J................. See Page 266
|Mining Locomotives.
Porter, Bell & Co.............•- - - - . . . . . . . . . . . . . . . . . ------- Pittsbur: h, Pa................ See Page 128
Mining Machinery. . . .
C. Henry Hall & Co........... ..... . ..................New York..................... See Page 4
J. B. Waring......... .................... • * * * * * * * * * * *• * * * * * “ ...................... $6 24
Rand & Waring Drill & Compressor Co.......... o &g ........ .......... See Front Page
The Atlas Works Pittsburgh, Pa....... ...... See Page 172
Winans & Co e - New York...................... “ 106
Mining Tools. -
Nelson Tool Works New York..................... See Page 30
Mathiesen & Schrader................................... New York..................... See Page 82
Towle & Unger Manufacturing Co.................. “ ..................... & 6 186
Mortising Machines.
England & Bindley Pittsburgh, Pa............... See Page 162
J. A. Fay & Co..., .....Cincinnati, Ohio........... e e 3 { % 206
Richards, London & Kelley............................ Philadelphia, Pa............. {{ 66
Wm. P. Kellogg & Co Troy, N. Y..................... $6 98

See also, Iron Working Machinery—Wood Working Machinery.
Moulders’ Tools.

Van Tuyt Manufacturing Co......................... New York.....................See Page 242
- Moulding Cutters. . . . . • ‘
D. Brewer & Co ...................Philadelphia, Pa........... ..See Page 246
Muck Bars. -

Chas. W. Matthews.............. e s a e s a e e s e e s e a e e s see e s e e s Philadelphia, Pa............ See Page 38

WHEEL GEARING—CONTINUED. (Haswell.) . To compute the Number of Teeth in a Pinion or Follower to have a given Velocity. RULE.—Multiply the velocity of the driver by its number of teeth, and divide the product by the velocity of the driven. - Example.—The velocity of a driver is 16 revolutions, the number of its teeth 54, and the velocity of the pinion is 48; what is the number of its teeth? - 16 × 54 + 48 = 18 teeth. - . . 2. A wheel having 75 teeth is making 16 revolutions per minute; what is the number of teeth required in the pinion to make 24 revolutions iu the same time? - . . . 16 × 75 -- 24 = 50 teeth. To compute the Diameter of a Wheel for a given Pitch and Number of Teeth. RULE.—Multiply the diameter in the following table for the number of teeth by the pitch, and the product will give the diameter at the pitch circle. . Example.—What is the diameter of a wheel to contain 48 teeth of 2.5 in 3. pitch? - - . . . 15.29 × 2.5 = 38.225 ims. To compute the Pitch of a Wheel for a given Diameter and number of Teeth. RULE.—Divide the diameter of the wheel by the diameter in the table (page 171) for the number of teeth, and the product will give the pitch. Eacample.—What is the pitch of a wheel when the diameter of it is 50.94

inches, and the number of its teeth 80?
50.94 + 25.47 = 2 ins.

To Compute the Number of Teeth of a Wheel for a given Diameter and Pitch. RULE.—Divide the diameter by the pitch, and opposite to the quotient in the table (page 171) is given the number of toeth.

L. A MIIPS a. In d SIG-IN A I L S.

Cor. Washington & Perry streets, -
BUFFAL0, NEW YORK.

ERIE CITY IRON WORKS, II, ER I ED, E H IN INT * A

• * * - - Nail Rods, . . . England & Bindley.......................................Pittsburgh, Pa............. ..See Page 162 - - Nalls–Cut. . . . Collier & Scranton; Oxford Iron Co............... New York - See Page 122 England & Bindley...................................... Pittsburg, Pa.................. $4 162 Geo. Worthington & Co................................. Cleveland, Ohio............... {{ 100 Jones & Laughlins...... ............... ............ Pittsburg, Pa.................. {{ 32 John W. Quincy............................................ New York............... ...... “ 178 Pratt & Co.................................................. Buffalo, N. Y.................. {{ 132 Sidney Shepard & Co.................................... “ .................. {{ 196 Wm. Green & Co ..Wilmington, Del......... go e e s to 4 & 248 See also, Nails—Wrought. :

'. Nails—Wrought. b. Brewer & Co............. Philadelphia, Pa.............See Page 246 Jno. W. Quincy............................................. New York...................... {{ 178 Pratt & Co................................................... Buffalo, N. Y.................. {{ 132 Wm. Green & Co....... ................................ ..Wilmington, Del.............. {{ 248

See also, Nails—Cut.

WHEEL GEARING—CONTINUED. .

PITCH of WHEELs. (Haswell.)

Showing the Diameter of a Wheel for a given Pitch, or the Pitch for a given Diameter.

o d 4 o & 63 e GD ‘ā: à c |3.3 à g | 84 8 to C 92 .: 3 c 3 .# 3 © 5 3 = zo so z à. so 2.É. Q - Inches. Inches Inches 8 ...... 2.61 45 ...... 14 33 82 ...... 26.11 9 ...... 2.93 46 ...... 14.65 83 ...... 26.43 10 ..... . 3.24 47 ..... . 14.97 84 .. 26.74 11 ...... 3.55 48 ...... 15.29 85 ...... 27.06 12 ...... 3.86 49 ...... 15.61 85 ...... 27.38 13 ...... 4.18 50 ...... 15.93 87 ...... 27.7 l4 ...... 4.49 51 ...... 16.24 88 ...... 28.03 15 ...... 4.81 52 ...... 16.56 89 ...... 28.33 16 ...... 5.12 53 ...... 16.88 90 ..... 28.65 17 ...... 5.44 54 ...... 17.2 91 ...... 28.97 18 ...... 5.76 55 ...... 17.52 92 29 29 19 ...... 6.07 56 ...... 17.8 93 ...... 29.61 20 ...... 6.39 57 ...... 18.15 94 ...... 29.93 21 ...... 6.71 58 ...... 18.47 95 ...... 30.24 22 ...... 7.03 59 ...... 18.79 96 ...... 30.56 23 ...... 7.34 60 ...... 19.11 97 ...... 30.88 24 ...... 7.66 61 ...... 1942 98 ...... 31.2 25 ...... 7.98 62 ...... 19.74 99 ...... 31.52 26 ...... 8.3 f3 ...... 20.06 100 ...... 31.84 27 ...... 8.61 .64 ...... 20.38 101 ...... 32.15 28 ...... 8.93 65 ...... 20.7 102 ...... 32.47 29 ...... 9.25 66 ...... 21.02 103 ...... 32.79 30 ...... 9.57 67 ...... 21.33 104 ...... 33.11 31 ...... 9.88 68 ...... 21.65 105 ...... 33.43 32 ...... 10.2 69" ...... 21.97 106 ...... 33.74 33 ...... 10.52 70 . 22.29 107 ...... 34.06 34 ...... 10.84 71 ...... 22.61 108 ...... 34.38 35 ..... . 11.16 72 ...... 22.92 109 ...... 34.7 36 ...... 11.47 73 ...... 23.24 110 ....... 35.02 . 37 ...... 11.79 74 ...... 23.56 111 ...... 35.34 38 ..... . 12.11 75 ...... 23.88 112 ...... 35.65 39 ...... 12.43 76 ...... 24.2 113 ...... 35.97 40 ...... 12.74 77 . 24.52 114 ...... 36.29 41 ..... . 13.06 78 ...... 24.83 115 ...... 36.61 42 ...... 13.38 79 ...... 25.15 116 ...... 36.93 43 ...... 13.7 80 ...... 25.47 11.7 ...... . 37.25 44 ...... 14.02 81 ...... 25.79 118 ..... . . 37.5

NoTE. The pitch in this table is the true pitch,

&– 2 ©
8 : ă §
c 3 ... to
2, E- so
Inches.
119 ...... 37.88
120 ...... 38.2
21 ...... 38.52
122 ..... . 38.84
123 ...... 39.16
124 ...... 39.47
125 ...... 39.79
126 ...... 40.11
127 ...... 40.43
128 ...... 40.75
129 ...... 41.07
130 ..... . 41.38
131 ...... 41.7
132 ...... 42.02
133 ...... 42.35
134 ...... 42.66
135 ...... 42.98
136 ...... 43.29
137 ...... 43,61
138 ...... 43.93
139 ...... 44.25
140 ...... 44.57
141 ...... 44.88
142 ...... 45.2
143 ...... 45.52
144 ...... 45.84
145 ...... 46.16
146 ......, 48.48
... 147 ... .....; 46.79
148 ...... 47.11
149 ...... 47.43
150 ...... 47.75
151 ...... 48 07
J52 ..... . 48.39
153 ...... 48.7
154 ...... 49.02
155 ..... 49.85

as before described.

GOLD AND SILVER MINING M A C H IN E R Y.