DE

CWRIGHTNYE

MACHINISTS' TOOLS,

WM. B. BEMENT & SON,

INDUSTRIAL WORKS,

Philadelphia.

Machine Shop, Foundry, Smith Shop and Boiler Shop Equipments. Railroad Shop Machinery

OF EVERY DESCRIPTION.

STEAM HAMMERS,

OF ALL SIZES.

Richards, London & Kelley..
Wm. P. Kellogg & Co.................

Van Tuyl Manufacturing Co.....

D. Brewer & Co......

Chas. W. Matthews..........

.Pittsburgh, Pa.......
..Cincinnati, Ohio.....
.Philadelphia, Pa.......
Troy, N. Y......

....See Page 162

206

See also, Iron Working Machinery-Wood Working Machinery.

Moulders' Tools.

New York.....

Moulding Cutters.

...See Page 242

Philadelphia, Pa........... .See Page 246

Muck Bars.

.....Philadelphia, Pa............See Page 39

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 X 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 X 7524 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 ins.

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.

Example.-What is the pitch of a wheel when the diameter of it is 50.94 inches, and the number of its teeth 80?

50.9425.472 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 teeth.

Cor. Washington & Perry Streets,
BUFFALO, NEW YORK.

ERIE CITY IRON WORKS,

BRIE, PENN'A,

STEAM ENGINES BOILERS

Circular Saw Mills, Eureka Head Blocks, Shafting and Pulleys,

AND DEALERS IN

Steam Pumps, Circular Saws, Belting, &c.

WHEEL GEARING-CONTINUED.

PITCH OF WHEELS. (Haswell.)

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

Inches.

Inches,

Inches.

Inches.

NOTE. The pitch in this table is the true pitch, as before described.