Early Space Satellite Solar Battery Vintage Trade Ad Card

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Early Space Satellite Solar Battery Vintage Trade Ad Card<br>NOTE:<br>THESE ARE NOT POSTCARDS<br>THEY ARE TRADE/ADVERTISING CARDS.<br>THEY ARE MUCH SMALLER THAN A STANDARD POSTCARD<br>AND<br>THERE IS ADVERTISING TEXT ON THE BACK!<br>THE CARD DIMENSIONS ARE APPROXIMATELY<br>2 5/8 '' x 1 3/8 ''  or  6.5 cm. x 3.5 cm.<br>ORIGINAL VINTAGE TRADE  ADVERTISING CARD<br>SOLAR BATTERIES<br>Do you know that the sun's rays have<br>been used to heat furnaces or to boil<br>water over many years? Different forms<br>of reflectors have been used for this pur-<br>pose. Some of them shaped like a bowl<br>fire. One of the most intriguing ways of<br>using the sun's energy is seen in the mod-<br>ern Solar batteries which are fitted into<br>space satellites like the one seen here.<br>When light falls on to a plate of pure<br>SILICON electrons are set free. The<br>surface of the plate is treated with:<br>BORON and an electric current is set up<br>by the electrons, which is collected by<br>wires and used to work the instruments<br>NOTE:<br>THE REVERSE SIDE HAS TEXT ABOUT THE IMAGE ON THE FRONT SIDE<br>THE CARD DIMENSIONS ARE APPROXIMATELY<br>2 5/8 '' x 1 3/8 ''  or  6.5 cm. x 3.5 cm.<br>NOTE:<br>THE IMAGE ABOVE IS LARGER THAN THE CARD<br>TO SHOW THE DETAIL.<br>SEE SCALED IMAGE ABOVE.<br>NOTE:<br>THE IMAGE ABOVE IS LARGER THAN THE CARD<br>TO SHOW THE DETAIL.<br>SEE SCALED IMAGE ABOVE.<br>THIS CARDS IS NOT A MODERN REPRODUCTION<br>IT IS AN ORIGINAL VINTAGE CARD<br>IT IS NOT PERFECT AND THIS CARD MAY HAVE ONE OR MORE OF THESE:<br>SLIGHT PAPER LOSS<br>SMUDGING<br>ROUNDED CORNERS<br>SURFACE CREASE<br>SEE THE IMAGES ABOVE!<br>33<br>WE COMBINE SHIPPING<br>BUY 1 TO 4 TRADE ADVERTISING CARDS AND THE TOTAL TO SHIP IS $2<br>BUY 5 TRADE ADVERTISING CARDS AND SHIPPING IS FREE<br>NOTE:<br>ON LARGER INTERNATIONAL ORDERS WE MAY REQUIRE REGISTERD<br>MAIL AND WILL SPLIT THE COST WITH THE BUYER.<br>INQUIRE IF CONCERNED!