No. 52 620. 



Impact Pressure. Velocity of Plow. Water Wheels. 



355 



52 624. 1 : 5. 



52 626. 1 : 6. 



52.616. Woltman's Mill, Figure, for measuring velocities of flow, improved pattern, d. 

 with counting mechanism for 1000 revolutions; axes running in agate and ball bearings; 

 bladevS 12.5 cm diameter and about 25 mm pitch 7. 10. 



If desired, the apparatus can be calibrated in Berlin or Munich. The fee is about 2. 12. 0, ex- 

 clusive of cost of carriage both ways. 



52.617. Rod for above, of glass tubing, 4 m long, can be folded in 2 parts, with point and 

 detachable base-disc and decimetre graduation 1. 5. 



52.618. Releasing Device, for fixing on the Eod, for use with small depths and velocities . 0. 18. 



Hydrometrical Mills, large or small Patterns, for high Velocities, with Electrical 

 Contact, Self-recording Gauge Indicator quoted for on application. 



52.619. Sectional Model of a Vane Water Meter, Figure . 4. 0. 



After passing the sack-shape sieve the water passes through the sloping channels distributed over 

 the area of the measuring space proper (a bottom beaker) and meets the blade wheel in jets with 

 tangential contact. The revolutions of the blade wheel are transmitted to the counting and indicating 

 mechanism. 



52.620. - - i d e in, of a Disc Water Meter 7. 0. 



2,621. --idem, of a Woltman Water Meter, for the passage of large quantities . . . 15.15.0 



52,622. Model of an Overshot Water Wheel, Figure, of lacquered sheet zinc, with water 



tank and collecting vessel 1. 4. 



2.623. - - idem, larger 1. 16. 



2.624. Model of an Undershot Water Wheel, Figure, of lacquered sheet zinc, with water 



tank and collecting vessel 1.4.0 



2.625. - - idem, larger 1. 16. 



2.626. Overshot and Undershot Water Wheel, combined to form one model, Figure, of 

 lacquered sheet zinc, with hose for connecting to the water wheel. The lower gutter 



can be detached . . . 2. 0. 



Cl. 5604,802, 

 803. 3795. 



23* 



