l8 PRESIDENTIAL ADDRESS SECTION A. 



wooden box covered with two layers of glass having a i-inch 

 air-space between them, and having the under surface of the 

 box insulated against heat loss downward by a 2-inch layer of 

 granulated cork and two layers of waterproof material The 

 boxes are mounted on supports which elevate them some 30 

 inches from the ground, and which permit them to be inclined 

 normal to the sun's rays at the meridian. These adjustments of 

 the inclination need only be made once in three weeks. There 

 are plane mirrors of cheap construction mounted on two sides 

 of the boxes in order that more rays of the, sun may be absorbed 

 and reflected upon the surface of the water vessel. The vessel 

 is connected at one end to a feed pipe from the water supply, 

 and at the other end to a steam pipe. The steam pipes of the 

 various units are connected together, and empty into a steam 

 main which conveys the steam to the engine. 



A plant of this nature has been set up in Philadelphia 

 capable of developing 4,825 lbs. of steam at atmospheric pres- 

 sure during eight hours. The capacity of the plant is estimated 

 to be three times this amount when it is finally set up in Egypt, 

 as intended. 



According to Sir J. J. Thomson, the radiant energy of the 

 sun in tropical countries amounts to 7,000 H.P. per acre. There 

 is therefore great chance for sun power in those tropical regions 

 where the sun shines almost throughout the year and fuel is 

 expensive. There is room now for half a million horse-power 

 in the nitrate district of Chile, and for general purposes in place- 

 where the outside temperature runs from no to 140 degrees. 



As an irrigation engine, it is claimed that there is no limit 

 to the amount of power that can be practically utilized. One 

 advantage of sun power or, in fact, of any condensing plant 

 for irrigating purposes is, the water used for the condenser costs 

 nothing, as the main output of the engine can be passed through 

 the condenser before entering the irrigating canals. 



The water-power of the world is being rapidly developed, 

 and is transmitted and used electrically. I find it recorded that 

 in the region bounded by the Alps, the Rhine and the Mediter- 

 ranean — an area of rather more than 2,000 square miles — there 

 were, in June of last year, hydro-electric stations of an aggregate 

 capacity of 475,000 H.P. at work, while in a Board of Trade 

 report issued in January last it was stated that 490,000 H.P. was 

 being used in Norway, and that work is proceeding for the 

 utilizing of a further 430,000 H.P.. while a still further 

 200,000 H.P. has been applied for. bringing the total to well over 

 1,100,000 H.P. 



Tn the New World much water power is being developed. 

 I have not been able to ascertain the extent, but a list of thirty- 

 three undertakings in Canada. Mexico, California and the 

 United States of America which I have gives a total of 

 1,178.000 H.P. 



