6. Every regulator should be given a name, generally that of a neighbouring village and not that of a channel, and the gauge book headings should be drawn up in an intelligent and systematic manner. Each main channel should be entered in order, and each regulator on the channel--together with the head gauges of all channels which take off there--should be entered, commencing from upstream. A specimen is given on page 109. Thus the head gauge of any branch appears in the register of the main channel from which it takes off, other gauges on the branch appearing in the register for the branch. And similarly as regards a distributary which has gauges other than the head gauge. 7. Each gauge reader should be supplied with a register, each page having, besides the counterfoil, as many detachable slips--marked off by perforations--as there are officials--usually the Subdivisional Officer, zilladar and suboverseer--to whom daily gauge reports are to be sent. The titles and addresses of these officials are printed on the backs of the respective slips. The slips and counterfoil have printed on them a form--similar to part of the specimen shown on page 109--showing the names of all the gauges read by that particular gauge reader, so that he has merely to fill in the date and readings, tear off the slips and despatch them. The posting of the register in the subdivision is facilitated if each gauge has a number and if the corresponding numbers are printed--besides the names--on the gauge slips. If the gauge reader does not know English, the headings of the slips are printed in the vernacular. If the gauge readings are telegraphed, there may be only one slip--besides the counterfoil--which is sent to the telegraph signaller. APPENDIX H. GIBB’S MODULE.[65] (See p. 164.) [65] This description has been supplied by Glenfield & Kennedy, Kilmarnock. The modules can, it is understood, be obtained from them. The attributes of a perfect module are many and varied, but in Gibb’s module they have all been successfully embodied in what is probably the simplest piece of apparatus of its kind ever devised. The following summary of the characteristics of Gibb’s module is, therefore, equivalent to an enumeration of the attributes of a perfect module:-- Gibb’s module Cannot be tampered with, } Cannot get out of order, } since it has no moving Silt or other solid matter in the water } parts, and because of its cannot affect its action, } extreme simplicity. Requires no attention, } It is accurate, } being designed on scientific Works with very small loss of head, } hydraulic principles. It is portable, and can be erected at any desired site very simply and easily. It is strong and durable.