The Railwayman's Pocketbook by R H N Hardy

Author:R H N Hardy [Hardy, R. H. N.]
Language: eng
Format: epub
ISBN: 9781784423346
Publisher: Bloomsbury Publishing
Published: 2019-11-24T00:00:00+00:00

Fig. 60.

THE SPEED OF THE TRAIN imparts the force necessary for lifting the water into the tank, and it will be found that from 15 to 20 miles must be attained before the water can be raised to the required height. At a speed of from 22 to 25 miles per hour, with a dip of 2ins., considerably over 2,000 gallons may be lifted into the tank when passing over a trough of average length, the quantity of water raised, however, remaining practically the same for any higher speed. Considerable resistance is exerted against the scoop as it moves through the inert body of water, and for this reason addi¬tional power is required to raise it, hence the necessity for steam or vacuum cylinders, etc., to assist when lifting the scoop into its normal running position. Draw bar-pull diagrams show that the resistance of the water under certain conditions may be sufficient to absorb all the pulling power of the engine while it passes over the troughs with the scoop down.

The importance of accurately knowing the amount of water in the tender tank for boiler feed purposes has already been mentioned, and any method whereby this may be automatically or continuously ascertainable will therefore be of interest.

The Areo water level indicator, fig. 61, as supplied by Messrs. Sydney Stone and Co., is so simple in design and construction that the risks of failure, due to the vibratory movements of the engine or tender, are reduced to a minimum. The apparatus consists of a small air chamber or generator (a) which is fixed at the bottom of the tender tank, and connected from the top by a small air tube (c) to a graduated gauge (d), which is placed on the boiler front plate in full view of the driver.

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