Benjamin Franklin Inventor Engineer Patriot Vintage Trade Ad Card

Description

Benjamin Franklin Inventor Engineer Patriot Vintage Trade Ad Card
NOTE:
THESE ARE NOT POSTCARDS
THEY ARE TRADE/ADVERTISING CARDS.
THEY ARE MUCH SMALLER THAN A STANDARD POSTCARD
AND
THERE IS ADVERTISING TEXT ON THE BACK!
THE CARD DIMENSIONS ARE APPROXIMATELY
2 5/8 '' x 1 3/8 ''  or  6.5 cm. x 3.5 cm.
THIS IS AN ORIGINAL VINTAGE TRADE  ADVERTISING CARD
BENJAMIN FRANKLIN
Franklin started exploring the phenomenon of electricity in 1746 when he saw some of
Archibald Spencer's lectures using static electricity for illustrations. Franklin proposed
that "vitreous" and "resinous" electricity were not different types of "electrical fluid" (as
electricity was called then), but the same "fluid" under different pressures. (The same
proposal was made independently that same year by William Watson.) Franklin was the first
to label them as positive and negative respectively, and he was the first to discover
the principle of conservation of charge. In 1748 he constructed a multiple plate
capacitor, that he called an "electrical battery" (not to be confused with Volta's pile) by
placing eleven panes of glass sandwiched between lead plates, suspended with silk cords
and connected by wires.
In recognition of his work with electricity, Franklin received the Royal Society's Copley
Medal in 1753, and in 1756 he became one of the few 18th-century Americans elected as a
Fellow of the Society. He received honorary degrees from Harvard and Yale universities
(his first). The cgs unit of electric charge has been named after him: one franklin (Fr) is
equal to one statcoulomb.
NOTE:
THE REVERSE SIDE HAS TEXT ABOUT THE IMAGE ON THE FRONT SIDE
THE CARD DIMENSIONS ARE APPROXIMATELY
2 5/8 '' x 1 3/8 ''  or  6.5 cm. x 3.5 cm.
NOTE:
THE IMAGE ABOVE IS LARGER THAN THE CARD
TO SHOW THE DETAIL.
SEE SCALED IMAGE ABOVE.
THIS CARDS IS NOT A MODERN REPRODUCTION
IT IS AN ORIGINAL VINTAGE CARD
IT IS NOT PERFECT AND THIS CARD MAY HAVE ONE OR MORE OF THESE:
SLIGHT PAPER LOSS
SMUDGING
ROUNDED CORNERS
SURFACE CREASE
SEE THE IMAGES ABOVE!
15
WE COMBINE SHIPPING
BUY 1 TO 4 TRADE ADVERTISING CARDS AND THE TOTAL TO SHIP IS
BUY 5 TRADE ADVERTISING CARDS AND SHIPPING IS FREE
NOTE:
ON LARGER INTERNATIONAL ORDERS WE MAY REQUIRE REGISTERD
MAIL AND WILL SPLIT THE COST WITH THE BUYER.
INQUIRE IF CONCERNED!