Waves

The undulations of waves are performed in the same time as the oscillations of a pendulum, the length of which is equal to the breadth of a wave, or to the distance between two neighboring cavities or eminences.

Dimensions Of Drawings For Patents

United States, all of drawing and signature to be within marginal line of 8 x 13 inches. Leave 1 inch margin, making the paper 10x15 inches.

Service Train Of A Quartermaster

The Quartermaster's train of an army averages 1 wagon to every 24 men. and a well-equipped army in the field, with artillery, cavalry, and trains, requites 1 horse or mule, upon the average, to every 2 men.

A Luminous Point, to produce a ritual circle, must have a velocity of 10 feet in a second, the diameter not exceeding 13 inches.

All solid bodies become luminous at 800 degrees of heat.

Wire And Hemp Ropes

A wire rope 3½ ins. in circumference, and a hemp shroud 8 ins. in circumference, parted in the rope at 10½ tons - 4,600 lbs. per •OUSTS inch.

Endless Ropes

The friction or adhesion of ropes is from .1 to .07 of their weight.

Brief Rules for the Computation of the Weights of Cast Iron Pipes and Cast and Wrought Iron Bolts.--(Horatio Allen.) - Cast Iron Pipes. - To the inner diameter of the pipe add the thickness of the pipe in inches, and multiply the sum by 10 times the thickness, and the product will give the weight in pounds per foot.

Wrought Iron Bolts

Square the radius of the bolt and multiply it by 10, and the product will give the weight in pounds per foot.

For cast iron, subtract 2.27, or, .074 of the result.

Malleable Or Aluminum Bronze

By weight: Copper, 90: Aluminum, 10. This composition may be forged either when heated or cooled, and becomes extremely dense. Its tensile rtrength is 100,000 lbs., and when drawn into wire 128,000 lbs, and its elasticity one half that of wrought iron. Specific gravity, 7700.

How To Compute The Weight When The Height Is Given

Rule

Multiply the weight of 1 foot in length of the material by the height of the modulus in feet, and the product will give the weight.

Stirling's Mixed Or Toughened Iron

By the mixture of a portion of malleable iron with cast iron, carefully fused in a crucible, a tensile strain of 25,764 lbs. has been attained. This mixture, when judiciously managed and duly proportioned, increases the resistance of cast iron about one-third; the greatest effect being obtained with a proportion of about 30 per cent. of malleable iron.

Bronze (gun-metal) varies in tenacity from 23,000 to 54,500 lbs.