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Feet of Board Measure to One Running Foot of Board.

(See application at head of table.)

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GEO. H. BLISS & CO.,

41 Third Avenue, Chicago, Ill.,

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TO FIND SOLIDITY OF ROUND TIMBER.

When all the dimensions are in feet.

Length multiplied by square of 4 man girth equal cubic foot.
When length in feet, girth in inches.

Multiply as above, and divide by 144.

When all dimensions are in inches

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.
When 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 use the following table as shown at foot of same.

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Area corresponding to the 14 girth in inches multiplied by length in fest gives solidity 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 1/4 of the girth of Round Timber,

PROVIDENCE TOOL COMPANY.

RHODE ISLAND NUT COMPANY.
WILLIAM H. HASKELL & CO.

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MANUFACTURERS OF

HEAVY HARDWARE RAIL ROAD SUPPLIES,

MARINE HARDWARE and SHIP CHANDLERY.

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The Pitch Line of a wheel, is the ci cle upon which the pitch is measured, and it is the circumference by which the diameter, or the velocity of the wheel, is measured.

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 straigut line drawn from the centres of two contiguous teeth upon the piton 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 on 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.

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.)

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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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