Large 1880's Harvey & Peak Tangent Galvanometer * London * 14" High

Description

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Here's a fairly large Harvey & Peak tangent galvanometer made in London ca. 1885-1890. The apparatus is complete, and it appears to original throughout
Tarnish on the brass parts, but no damage to the needle or the glass lens. The wood frame is in good condition, with a decent original finish, and both of the original coils are still intact. Printed dial is in good original condition, with no stains or browning. Compass needle swings freely and is not bent or otherwise damaged. Lens is loose, not glued into frame
Will be partially dis-assembled for safe shipping.
The instrument measure approximately 13" wide x 14" high.
Shipping weight, properly packed and padded, will be approximately 10 lb.
That's about it. I've been shipping fragile antiques around the globe for decades and can assure you that your purchase will arrive at your doorstep in the same excellent condition in which leaves it mine.  Buyer prepays and includes shipping.
dial-E Ducretet
RARE DIAL TELEGRAPH NICELY SHAPED
E. DUCRETET C1870
Complete FRENCH Dial - ABC  Telegraph Station
composed by :
1) A round horizontal dial
TRANSMITTER
or sending Key
. Tx
2) A round vertical
dial
RECEIVER
.
Rx
Both built on a mahogany board
TECHNICAL DESCRIPTION :
(
Translated from "Guide Pratique de TELEGRAPHIE"
By Louis HOUZEAU - Paris 1881
)
<<
The KEY is a round dial in the center of which a crank swivels.
On the transmitter dial letters and figures are engraved in the same order that on the dial of the receiver.
Opposite each one of these signals there is a notch which allows stop the crank on the corresponding letter.
While turning the crank,  a small spring moves up and a two ways switch sends the electrical current on the
telegraph line and to the receiver of the corresponding station.
In order that the distant station can understand the correspondent , it is mandatory that the needle of the
receiver agrees always with the crank of the sending Key.  For that it is necessary that the needle and the
crank are always in the  " cross " position when the apparatus is not used.
CALL:
To call the correspondent is perform to turn the 'in Line' switch
,
turn the crank for a while on the letter "A" and finish on the "cross" position.
Then the electric current will run
The Corespondent indicates "ready to receive" when placing its switch on the  "open line" position
by making a complete turn of crank;  Then he puts the needle on the
"cross"
position &
the transmission can start.
>>
EARLY INSTRUMENT IN PERFECT ORIGINAL CONDITION , not cleaned.
Notes and remarks :
-
Each dial show a concentric engraved set of letters from
A to Z and a cross
include the two letter V & W ( mean a first generation telegraph )
-
I
n 1864
Eugene Ducretet , 20 years old , began his first activity as a
manufacturer of scientific apparatuses at "21 rue des Ursulines Paris"
The maker name is printed on both dials
Tx : Mahogany base
7"x 8.25"
(17,5x21cm)
Round dial diameter 5 inch
Rx : Mahogany base 7"x 8.25"
(17,5x21cm)
Round dial diameter 5 inch
Total Weight 2850 g.  ( 6.3 pounds )
BUYER PAYS actual SHIPPING cost
USA , CANADA or ASIA :
$ 50.00 By "registered" Air Priority service  ( 1 - 2 weeks delivery )