The San Francisco Call. Newspaper, February 4, 1900, Page 11

SUNDAY CALL. 11 & - THE and &lectricity JDoomed to fall Before Concentrated JSunpower? — [iii:=ii-iin the hardest metals in the dead of winter, 1 have burned a brick half way through frames. To this Dr. Calver led the party, and with the f in half an hour, and by concentrating all} the heat on one spot I have made thes surface of the brick so hard that it the fact that scratched steel. The heat which can be e is attested by streaked with gray. me in front of him inventions he is not 2 ‘alotn: ken out on the s plained the m ds of construction and C¢Ollected from this big hellomotor—I| £ the pon the the results that could be obtalned from SPeak of it comparatively, for It was only’ % 1t. built for experimental purposes—is eq! ‘ 2 slisult “I cannot,” sald he, “go into the his- S . P Gie tory either of my own work or that of - ribe my inventions those who have preceded me in this line. & ° ma swer to a question. Suffice it to say tr my prede- cessors has ever » obtaln a reflector which. at of the day would concentrate single point any constderable amount ¢ light; concave mirrors, great 1 sses and an funr hem for this as the led me before I hit s named the ‘he- ated means meres few kind, Dr. Calver sald g good friends v done and hav of them would run Dr. Calver picked centrated from one in the course of a twelvémonth to that furnished by the combustion of forty tons of the best coal. With two of these small contrivances in the back yard a man could have all his water pumped into his house, all of his cooking and heating his experimental tools When asked in lteved the effect SHIP PROPELLED BY THE : HELIO-MOTOR t from, the . i ! b R \ \ M. e A presented moves to an 1 cloudy t and days. losure stood a ¥ of wood to somewhat rom this, as the the reser- and keeps stored. The con- sun are thrown = of glass upon ie heat is caught, ained fn the sub- be stone, to prove the uctor of neat it for use centra through two a dark inner surface 80 to speak, and stance at the cer earth or any cheapest and be in the vicinity wher ing bullt. In the sm: object wooden located eppeared ands of them. They BORATORY AND EXPERIMENTA| HELIO Mo t great big burnished glasses with 1ly expect to cateh for fuel; but number- ur inches by six, Dr. These were set in n a frame whose y convex. rance to the laboratory, to be about a half acre in the largest of the mirror general Oppo which see extent, stood have stored heat and kept the tempera- ture within high enough to boil water at the end of a week. A larger reservoir would prove more t and less wasteful of heat than the one I have here. ““There ars 130 square feet of glass in this frame. That means the reflection of 130 feet of sunlight. The combined force of the other heliomotors in the yard about