. Cassier's magazine. enerally takesthe form of a stiff beam, upon which theplaning head slides, and also has a slot-ting motion. The beam being boiledto the job, the head can operate on anyportion of the work within reach. It may be driven by ropes or elec-trically, the latter being more conven-ient. Variations in this design are al-ways increasing, and with the growingmass and sizes of castings and forgingsnow employed, especially in engine andelectrical work, the demand for suchportable machines is bound to becomegreater and greater. It is thus abundantly evident that ifthe planing machine
. Cassier's magazine. enerally takesthe form of a stiff beam, upon which theplaning head slides, and also has a slot-ting motion. The beam being boiledto the job, the head can operate on anyportion of the work within reach. It may be driven by ropes or elec-trically, the latter being more conven-ient. Variations in this design are al-ways increasing, and with the growingmass and sizes of castings and forgingsnow employed, especially in engine andelectrical work, the demand for suchportable machines is bound to becomegreater and greater. It is thus abundantly evident that ifthe planing machine is having consid-erable portions of its work appropriatedby the milling machines, its capabilitiesare being enlarged in other directions,and the planers appear to be as firmlyestablished as ever. This is partly dueto improved and specialised designs,but largely also to improvements in thedetails of the older types on the linesindicated in the preceding pages. THE COMMERCIAL DEVELOPMENT OF WATER POWER Bv Alton D. Adams. NDEV ELOPEDwater power i ssometimes re-garded like a richgold mine, that is,as a property thathas only to beworked in orderto yield largeprofits. Nothingcould be furtherfrom the facts insome cases. Themere circum-stance that astream with a con-siderable volumeof water flows be-tween high banksor some miles, so that it may be readilydammed up, or that it plunges over arather high fall, does not necessarilygive it any value whatever for powerpurposes. In other words, engineeringpracticability is no sufficient test ofcommercial expediency in the develop-ment of water power. For the successful development ofwater power from the financial point ofview, it is a prime necessity that therebe population by which, or industries inwhich, the energy can be utilised. Thenext important question relates to thecost of the development and the incomethat can be obtained by the sale ofpower. Both of these matters dependto a large extent on the constancy ofthe power, and on its mini
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