Kelvin Mariners Compass Inventor Galvanometer Physics 90+ Y/O Trade Ad Card

Description

Kelvin Mariners Compass Inventor Galvanometer Physics 90+ Y/O 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 90+ YEAR OLD TRADE  ADVERTISING CARD
LORD KELVIN COMPASS
Along with a talent for mathematics, Lord Kelvin (William Thomson) had a practical ability
for solving problems. This could range from a dripping tap to poor signals from a telegraph
cable.
It led him to invent instruments that helped with communication and marine navigation, as
well as physics.
Among his main inventions and discoveries were:
The absolute temperature scale, now known as 'the Kelvin scale'
The second law of thermodynamics
Telegraph cables and the galvanometer
Marine instruments
A theory about the shape of atoms
The tetrakaidecahedron.
He invented several instruments to improve navigation and safety. One notable example was
a mariner's compass more accurate than any other in existence. This was later universally
adopted.
Kelvin's mariner's compass and 'compass card' were installed on the ship HMS Discovery.
This is now a museum, berthed in Dundee
NOTE:
THE REVERSE SIDE HAS TEXT ABOUT THE IMAGE ON THE FRONT SIDE
THE CARD DIMENTIONS 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.
THIS CARDS IS NOT A MODERN REPRODUCTION
THIS CARD IS 90+ YEARS OLD
IT IS NOT PERFECT AND THIS CARD MAY HAVE
SLIGHT PAPER LOSS
SMUDGING
ROUNDED CORNERS
SURFACE CREASE
SEE THE IMAGES ABOVE!
2hill
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!