by an electric motor, the power being transmitted from the armature by belt connection to the rim of a large flywheel-pulley attached to the crank disc of the pump. The outfit at E is similar in operation to that shown at C, except that a two cylinder air compressor is used. This is practically the same in general construction as the other forms illustrated, except that the use of two cylinders makes for a more steady flow of air.

A complete air compressor outfit provided with automatic regulating means and an apparatus to distribute air at the curb is shown at Fig. 45. This enables automobile owners to secure a supply of air without having to drive the car into the garage or dragging a portable air compressor outfit across the sidewalks. The accompanying diagram clearly shows the arrangement of this outfit. A tank is buried in the ground and this connects with the compressor outh located in the basement. The lid of the curb box is flush with the sidewalk and in a few inches from the curb, The user raises the lid, takes out the hose and when the operation of tir inflation is complete, the hose returns to the box automatically when it is released. The air compressor installation consists of a reservoir or tank in the basement, an air compressor driven by an electric motor and a control panel. When the air pressure in the tank reaches a certain predetermined amount, an automatic switch breaks the circuit and the motor ceases to drive the pump. As soon as the pressure falls below the minimum allowable, the automatic switch again functions to close the circuit and start the pump going. In addition to the pipe leading to the curb box a branch pipe may be run to the garage interior and to the repair shop as well.

Liquid Fuel Storage. The problem of liquid fuel storage is an important one for garages or repair shops, especially in cities where the municipal regulations pertaining to the storage of volatile hydrocarbons are severe. If the fuel is to be used only for shop purposes, either of the fuel storage systems shown at Fig. 46, A and B, will prove practical. That at A is the hydraulic system in which the gasoline stored in an underground tank is forced out by displacement, water flowing into the tank from the city main. The outfit at B also includes an unde

ground tank which is placed outside of the walls of the building, but the gasoline is drawn from the tank by a plunger pump. Where gasoline is sold to passing motorists two appliances that will promote quick service are shown at Fig. 46, C, and D. That at C, is a box designed to be placed outside of the garage or repair shop near the door or driveway so that cars do not need to run into the garage to be filled. This serves merely to support

a measuring pump drawing fuel from an underground tank and hose which will extend from the pump to the fuel container of the car. The outfit shown at D, consists of a rectangular tank mounted on wheels and having the usual form of measuring pump. This tank will hold several barrels of fuel, can be moved easily

from place to place and the measuring pump insures that the liquid will be dispensed in proper quantities and without waste.

The principle of action of the hydraulic fuel supply system is shown at Fig. 47, A. The various parts comprising the assembly are clearly outlined. When it is desired to draw out gasoline it is merely necessary to open the water control valve which permits. water to flow into the tank to displace the fuel. At Fig. 47, B, the

usual form of automatic measuring pump is shown. This is provided with a series of stops, so quantities varying from one pint to one gallon may be pumped by limiting the stroke of the pump. A two-way discharge is provided, one for filling cans, the other for attaching a supply hose to reach to the car tank. A meter is fitted

Shops.

that will indicate every gallon pumped. The pump plunger is actuated by a spur rack which is operated by a pinion turned by a hand crank. But little force is needed to operate this pump owing to the large leverage provided by the hand crank and the small pitch radius of the pinion.

Complete Forge Equipment Desirable.-Quite a number of repair jobs involve blacksmithing or brazing processes and two distinct forges should be installed. The usual equipment is a steel forge of medium size, with a power-driven rotary blower, to be used for forging and welding. For brazing, melting babbitt metal, hardening and tempering, annealing, and heating soldering irons a gas forge should be used, this taking its air from

Equipment.

the tank of the air compressor outfit, and its gas from the city or town mains. In the smaller towns and villages the portable gasoline brazing forge can be used to advantage, providing that coal or water gas is not available. In the accompanying illustration, Fig. 48, a simple and practical forge outfit is shown, this including both gas and coal burning types. Between the coal and gas forge, a stout bench is usually erected, this having a strong vise and a large drawer. This bench can be used in both brazing and soldering processes, and the drawer can be divided into two compartments, one to hold the blacksmith tools, the other the soldering irons and sheet metal tools. The vise is handy to the workman at either forge. The remaining equipment is simple, a medium sized anvil, heavy