This section is from the book "A Treatise On Beverages or The Complete Practical Bottler", by Charles Herman Sulz. Also available from Amazon: A Treatise On Beverages.
The water passes through this filter under high pressure; it is air-tight, and can be instantly cleansed by turning the hand on the dial plate at a point thereon marked "filtered," to a point marked cleansing.
Fig. 28. - Hydrant High Pressure Filter.