In all cases the link requires but a slight movement, not exceeding one-eighth of an inch.

All the points of bearing on lever must be in the same plane.

The distance of the fulcrum must in no case be less than the diameter of the valve-opening. The length of the lever should not exceed the distance of the fulcrum multiplied by ten.

The width of the bearings of the fulcrum must not be less than three-fourths (34) of one inch. The length of the fulcrum link should not be less than four inches.

The lever and fulcrum link must be made of wrought-iron or steel, and the knife-edged fulcrum points and bearings for the points must be made of steel and hardened.

The valve, valve-seat, and bushings for the stem or spindle must be made of composition (gun-metal) when the valve is intended to be attached to a boiler using salt water; but when the valve is to be attached to a boiler using fresh water, and generating steam of a high pressure, the parts named, with the exception of the bushings for the spindle, may be made of cast-iron.

The valve must be guided by its spindle, both above and below the ground seat and above the lever, through supports either made of composition (gun-metal) or bushed with it.

The spindle should fit loosely in the bearings. or supports.

When the valve is intended to be applied to the boilers of steamers navigating rough waters, the fulcrum-link may be connected directly with the spindle of the valve; providing always, that the knife-edged fulcrum points are made of steel and hardened, and that the vertical movement of the valve is unobstructed by any lateral movement.

In all cases the weight must be adjusted on the lever to the pressure of steam allowed in each case by a correct steam-gauge attached to the boiler. The weight must then be securely fastened in its position and the lever marked, for the purpose of facilitating the replacing of the weight should it be necessary to remove the same; and in no case shall a line or any other device be attached to the lever or weight except in such a manner as will enable the engineer to raise the valve from its seat.

Donkey boilers used on all steam vessels for driving pumps, hoisting engines, electric lights, or other purposes, must be inspected the same as the main steam-boilers, and supplied with water and steam gauges, and the safety-valves must comply with the same regulations as the main boilers.

The area of all openings in boilers and connections leading from boilers to safety-valves, both the lever and spring-loaded valves, used on marine boilers, shall not be less than the area of the valve used in said safety-valve.

25. All steam-gauges heretofore in use on steamers shall be admissible by the inspectors, and other steam-gauges hereafter made, of equal merit, shall be allowed.

26. All boilers or sets of boilers shall have attached to them at least one gauge that will correctly indicate a pressure of steam equal to 80 per cent. of the hydrostatic applied by the inspectors.

27. The appliances in use on steamers constructed prior to the 28th of February, 1872, for determining the height of water in the boilers shall be considered reliable low-water gauges.

28. There must be means provided in all boilers using the "low-water gauges," which are operated by means of a float inside the same, to prevent the float from getting into the steam pipe.

29. In applying the hydrostatic test to boilers with a steam-chimney, the test-gauge should be applied to the "water-line" of such boilers.

30. All horizontal cylindrical boilers used on steamers navigating the waters flowing into the Gulf of Mexico shall be provided with a reliable low-water gauge.

31. The hydrostatic test applied to the boilers of towing freight-boats on the Mississippi River and its tributaries shall be in the proportion of one hundred and fifty (150) pounds to one hundred pounds working steam pressure allowed;

and the inspectors shall test all such boilers on said steamers for the amount of steam allowed.

STEAM PRESSURE ALLOWED ON BOILERS.

Inches. Pounds Pounds. Pounds. Pounds. Pounds. Pounds. Pounds.

1. Before an original license is issued to any person to act as a master, mate, pilot, or engineer, he must personally appear before some local board or a supervising inspector for examination; but upon the renewal of such license, when the distance from any local board or supervising inspector is such as to put the person holding the same to great inconvenience and expense to appear in person, he may, upon taking the oath of office before any person authorized to administer oaths, and forwarding the same, together with the license to be renewed and Government fee, to the local board or supervising inspector of the district in which he resides or is employed, have the same renewed by the said.

inspectors, if no valid reason to the contrary be known to them; and they shall attach such oath to the stub end of the license, which is to be retained on file in their office. And inspectors are directed, when licenses are completed, to draw a broad pen and red ink mark through all unused spaces in the body thereof, so as to prevent, so far as possible, illegal interpolation after issue.

2. The classification of engineers on the lakes and seaboard shall be as follows:

Chief engineers of ocean steamers.

Chief engineers of lake, bay, and sound steam

ers.

Chief engineers of river steamers.

First assistant engineers.

Second assistant engineers.

Third assistant engineers.

Special engineers.

All steamers of over one hundreds tons burden shall carry at least one chief engineer.

First assistant engineers may act as first assistants on any steamer.

Second assistant engineers may act as first assistants on steamers of seven hundred and fifty tons and under, and second assistants on any

steamer.

Third assistants may act as second assistants on steamers of 750 tons and under, and third assistants on any steamer.