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Machinists' Tools.

Bolen, Crane & Co...... Newark, N. J.................. See Page 62
Buffalo Machinery Agency Buffalo, N. Y.................. {{ 160
Geo. Worthington & Co ..Cleveland, Ohio............... {{ 100
Isaac H. Shearman.......... & e o e o e o e o see e. e. e. e. e. e. e. e. e. e. e. e o e s a se Philadelphia, Pa............ {{ 80
L. W. Pond .......... Worcester, Mass.............. & 4 158
Nelson Tool Works....................................... New York...................... { % 30
The Pratt & Whitney Co.................. to e - - - - - e o e o 'o - . Hartford, Conn.............. {{ 142
Thorne, De Haven & Co................................. Philadelphia, Pa............. { % 38
Wm. B. Bement & Son................................... { % “ ............ { % 168
Wm. Sellers & Co......................................... e “ “ ............ {{ 64
- Malleable Iron Castings and Fittings.
Crane Bros. Manufacturing Co........................ Chicago, Ill.................... See Page 230
Phelps & Sanger....................... • * * * * * * * * * * * * * * * * * * * Cleveland, Ohio.............. {{ 120
Manufacturers Agents.
Winans & Co................. ......................... . ... New York..................... See Page 106
Marine Forgings.
De Laney & Co.......... © e o 'o e o e o e o os e e o os e o e o e o os e o e - e. e. e. e. e. e. e. e. e. Buffalo, N. Y.................. See Page 98
Marking Cards.
W. W. Wilcox.............................................Chicago, Ill.................... See Page 190
Masons' Tools.
England & Bindley....................................... Pittsburgh, Pa............... Sea Page 162
- Mathernatical Instruments. -
F. Eckel................. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * New York..................... See Page 76
F. S. Pease............ to e to e o 'o - © e o 'o e o e o s Buffalo, N. Y.................. ( * 100
Kuebler & Seelhorst........................... ^ - e o 'o - e. e. e. e s Philadelphia, Pa............ & © 216
Wm. J. Young & Sons.................................... {{ “............ {{ 138
Mattocks.
Hermann Boker & Co.................. New York............... See Pages 152,154
Mauis, -
Hermann Boker & Co............ ....................... New York........... ....See Pages 152,154
Nelson Tool Works {{ “. ....................... See Page 30

BOARD MEASURE–CONTINUED.
Feet of Board Measure to One Running Foot of Board.
(See application at head of table.)
Width of Board in Inches.

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GEO. H. BLISS & CO.,

41 Third Avenue, Chicago, Ill.,

MANUFACTURERS AND DEALERS IN

TELEGRAPH INSTRUMENTS and SUPPLIES.

ELECTRICAL APPARATus.

instruments, Cables and Gutta Percha Wire,

Instrument Fixtures, Magnet Wire,
Batteries and Utensils, Office Wire,
Chemicals, Office Fixtures,
Galvanometers, Telegraph Poles,
Line Material, Medical Apparatus,
Repairers' Tools, Electric Bells.

HOTEL ANNUNCIATORS.

FIRE * BURGLAR ALARMS.

sEND For A CATA Lo GUE.

Measuring Tapes.

F. Eckel....................................................... New York........ ............see Page 76
Mechanics' Tools.
Newcomb Bro's Sons............ * * * * * * * * g o e o 'o e o 'o e o 'o g o e o go & New York..................... See Page 88
Medical Apparatus—Electrical and Cutta Percha. -
Bishop Gutta Percha Works..........................New York..................... See Page 34
Charles T. Chester......................................... {{ “ ..................... {{ 212
Leclanche Battery Co..................................... {{ " ..................... é £ 96

TO FIND SOLIDITY OF ROUND TIMBER.

When all the dimensions are in feet. Length multiplied by square of $4 ms an girth equal cubic feet. hen length in feet, girth in inches. Multiply as above, and divide by 144. hom all dimensions are in inehes Multiply as above, and divide by 1728.

TO FIND SOLIDITY OF SQUARE TIMBER.

When all dimensions are in feet.
Length multiplied by breadth multiplied by depth, equal cubic feet.
en either dimensions are in inches.
Multiply as above, and divide by 12. .
When any two of the dimensions are in inches.
Multiply as above, and divide by 144. -
Or wse the following table as shown at foot of same.

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Area corresponding to the 34 girth in inclies multiplied by length in feet gives

soliditv in feet and decimal parts for either square or round timber.

In Round Timber take the mean girth. Square Timber take the side, which in practice corresponds with 94 of the girth of Round Timber,

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Merchant Iron.

Jno. A. Griswold & Co....................Troy, N. Y..................... See Page 50
Jones & Laughlins...................................... ..Pittsburg, Pa.................. {{ 32
Pittsburgh Bolt Co....................................... “ ........................ $6 118
Pittsburgh Forge & Iron Co........................... “ ........................ {{ 174
Pratt & Co................................................... Buffalo, N. Y.................. ( (. 132
Reese, Graff & Woods. .................................. Pittsburg, Pa.................. “ 68
Rogers & Co................................................. Chicago, Ill.................... 6 * 144
- Metal Blanks. .."
Mathiesen & Schrader................................... New York...................... See Page 82.
W. W. Wilcox.............................................. Chicago, Ill..................... { % 190
- Metal Cornices.
Hart, Ball & Hart................. to e e o is to e o e o e o e o is e e o so e s to & to Fuffalo, N. Y................. See Page 136
Noyes & Wines New York..................... “ 264
Metallic Packing.
A. Fulton's Son & Co....................................Pittsburgh, Pa...............See Page 116
Metallic Paints.
Wose, Dinsmore & Co e - ..New York..................... See Page 60
Jno. W. Masury & Son $6 , so e s to e o e o e o e o is e s to 3 e o 'o o { { 214
Prince's Metallic Paint Co . . . $4. © to * to e o go e o 'o e o e o $ to to e to to e {{ 236
Metallurgists. -
DuPlaine & Reeves ..........Philadelphia.................. See Page 102
Metals, Domestic and Irmported.
Du Plaine & Reeves...... ..... & e o e o e o e o e g o e g o & © to £ to o & # 4 g o os Philadelphia, Pa........ ....See Page 102
Tyng & Co................................................... New York............. to do o e o e o e & § { 260

W IIEEL GEARING.—4 PAGES.
TERMs or NAMEs. (Haswell.)

The Pitch Line of a wheel, is the cit cle upon which the pitch is measured, and it is the circumference by which the diameter, or the velocity of the wheel, is measured. - * -- 2 *, * ~. The Pitch is the arc of the ci cle of the pitch line, and is determined by the number of the teeth in the wheel. The True Pitch (Chordial), or that by which the dimensions of the tooth of a wheel are alone determined, is a straig at line drawn from the centres of two contiguous teeth upon the pitoll line. . The Line of Centres is the line between the centres of two wheels. The Radius of a wheel is the semi-diame:er running to the periphery of a tooth. The Pitch Radius is the semi-diameter running to the pitch line. A Mortice Wheel, is a wheel constructed for the reception of teeth or cogs, which are fitted into recesses or sockets upon the face of the wheel . . A wheel which impels another is termed the Spur, Driver or Leader; the o impell d is the Pinion, Driven or Follower. A s ries of wheels in conn ction with each other is termed a Train. When two wheels act upon one another, the greater is termed the Wheel, an the lesser the Pinion. • When a Pinion is driven by a wheel, the number of teeth in the pinion should not be less than eight. - . . When a Wheel is driven by a pinion, the number of teeth in a pinion should not be less than ten. - , 2 The Number of teeth in the wheel should not be divisible by the number of teeth in the pinion without a remainder This is in order to prevent the same teeth coming together so often as to cause an irregular wear of their faces.

PROPORTION of TEETH of WHEELs. (Molesworth.) > From pitch line to top of tooth............... ..................... = Pitch x 0.33

Total depth of teeth................................................................... = Pitch X 0.75
Thickness of tooth on pitch line................................................ = Pitah *::::
Space between teeth on pitch line............................................. = Pitch × 0.55
Thickness of rim of wheel ......................................................... = Pitch X 0.45
Thickness of arms if flat............................................................ — Pitch X 0.45
Ordinary width of teeth in small pitches........................... e e a s a e s is e = Pitch X 2.
{{ 66 “. large “ .................................... = Pitch X 3.
Thickn SS round centre.................. ............................................ = Pitch X 1.3

Mortice wheels to be wider than iron wheels by twice the thickness of the rim or by pitch X 0.9; their rim to be double the thickness of that of iron wheels.

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