Carl Zeiss Jena Subtense Bar Staff Basislatte Bala 2 m Set in Box NOS

Description

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Description:
MPN: 21842
Made in Germany (DDR) - Carl Zeiss Jena in early 60's on order armed forces.
WE SEND WOODEN BOX ONLY IN EUROPE UNION : FOR INTERNATIONAL BUYERS ONLY ITEMS WITHOUT BOX !
The 2 m subtense bar from Zeiss Jena is a 2 piece light metal tube which you can stuck together via a screw flange. The ends of the tube have targets at exactly 2 m separation. They can also be illuminated ellectrically with a illumination set. You will receive also the illumination set, but accumulator (storage battery) is NOT a part of the set. The small lamps were normally equipped with small 2,5V 0,2A bulbs. Inside each half of the rod there is an invar bar for temperature compensation. Invar (nickel-iron alloy) is unique in its resistance to the temperature changes, so unlike other metals it will not expand or contract (it is from word invariable). Subtense bar is also called parallactic bar, because it was used as a base by measuring parallactic angle with precision theodolites, like for example Theo 010. Once all is set up, observer will measure the angle from his position to each end of the 2 m markings on the subtense bar, do some calculations and he will get the distance from the observer to the centre point of the bar.
Color: army green - typical for after war period until early 60's - then they have used light grey and finaly orange-yellow.
Weight of the whole wooden transport box including all the items is over
15 kg
Dimensions of the box are app 156 x 19 x 17,5 cm
Condition: USED condition, the subtense bar itself is in perfect condition with only couple of scratches. Triangle in the optics is clear, there is a small black fragment or dirt in the right down corner, but that is nothing serious. Wooden box has typical longer storage marks and scratches from moving and replacing, there is also a crack in the box from below visible in the gallery below this description. Illumination set has oxidation marks on the untreated parts and peeled of color. Tribrach also visibly used, but still in nice and fully operational condition. Please look at the gallery pictures and also at pictures below the item description for more details.
For International buyers item set will be safely packed and shipped via Bulgarian post - registered mail with track number.
If you have any other questions regarding this article, do not hesitate to contact us, you are welcome!
What a super addition to any collection ~  just waiting to be displayed or used.
Good Luck & Happy Treasure Hunting!
See  photos for actual condition and contact with me for everything you want to know about this item
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