RARE MHR1 U-Boat WWII Höhenrechenschieber German Cylindrical Piston Slide Rule

Description

Description:
An extremely rare piece of field gear that would have been used for navigation on a German U-Boat during WWII. It is in very good condition and sits within original 12 5/8” x 4 ¼” x 3 ½” hinged wooden case with inner label plaque indicating “MHR1 Höhenrechenschieber”.
This cylindrical calculating rule was designed to solve problems in spherical trigonometry encountered in navigation. For example, it could be used to compute the altitude and azimuth of a celestial body, knowing the latitude of the observer and the hour angle and declination of the body. Such a slide rule was patented by the Englishman Leonard C. Bygrave in 1921. This example, serial number 90165, was manufactured in Germany by Dennert and Pape at about the time of World War II.
It consists of three concentric cylinders. The innermost cylinder can be extended, and the outermost cylinder then slides up and down on part of the extended tube. Tightening a knob at the top fixes the relative position of the two inner cylinders. The innermost cylinder has a helical scale divided from 0 to 90 degrees (also from 180 down to 90). The middle cylinder has a helical scale marked from 0 to 90 and also from 145 to 90. At the bottom, the middle cylinder has instructions for using the instrument. The outermost cylinder has two marks for reading results, declination tables, formulas, and a window that allows for reading the second scale.
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International shipping is handled through USPS Priority ONLY unless the buyer prefers First Class in which case we DO NOT ACCEPT ANY LIABILITY once the parcel leaves the U.S. and/or can no longer be tracked. Please note that we will NEVER falsify information such as lowering the sale price, etc. Buyers accept all responsibility for customs charges and
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About Us:
We are a New England Estate Appraisal and Liquidation company based in Rhode Island. We work mainly on the acquisition and liquidation of estates of all sorts.
The majority of the items offered are acquired from New England estates and may vary from jewelry to china or artwork and even electronics on occasion.
IMPORTANT:
Terms of Sale:
Since our items are from estates they are almost always one of a kind. We do not offer exchange for this reason. Returns are ONLY accepted in the event that the item was GROSSLY misrepresented in the listing and any return must be completed within 14 days from date of arrival and will be offered as a refund of the purchase and shipping costs.
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