( ARISTO-Werke ) Dennert & Pape, Hamburg / Germany (1929) *********************************************************** VERSION (A) S C A L E S of the DENNERT & PAPE MANNHEIM POCKET =========================================================== Front Side Back Side =========================================================== ( 0 ... 13 cm Ruler ) A X2 ----------------------------------------------------------- B X2 S sin(0.01X); sin(0.1X) L lgX C X T tan(0.1X) ----------------------------------------------------------- D X ( 0 ... 5" Ruler ) R E M A R K S : ( 1° = 60' ; 1' = 60" ) =========================================================== The TRIGONOMETRIC SCALES are divided in MINUTES & SECONDS S keyed to A/B ; T keyed to C/D VERSION (A) *********** This old model is made of mahogany with scales on celluloid veneer. For the manufacturer the engravements in the bottom »D&P« and »29« could be interpreted as "Dennert & Pape" and "1929". Ref. to the print on the back side and on its leather cover, this old Pocket Slide Rule was a gift from the constructor company » WAYSS & FREYTAG A.-G., DRESDEN « well known for their engagement in reinforced concrete. Because the original cursor was missing, there is a home- made of aluminum with a window of PVC from a CD case. The hairline is made with a »X-ACTO« and colored with a marker. Historical Remarks ... VERSION (B) *********** There is NO Year Code - The engravement in the bottom reads » DENNERT & PAPE ALTONA « The CURSOR has a print »PERTODO« May be the Pocket SR was a gift from this company ? The picture from the side shows construction details: The mahogany strips are glued on the celluloid base - and the glass of a "Frameless Cursor" has grooves for the clips ... ... The SCALES got EXTENTIONS in RED right and left and have lost the historical "Ladder" pattern. impressum: *********************************************************** © C.HAMANN http://public.BHT-Berlin.de/hamann 06/17/10 |