Dang, wish BF would allow longer editing as it would save another post. In perusing over the 1934 Dumaurier catalogue I note Busch Terlux offerings in 24, 18, 15 & 10x. The 15x, that I own, is listed as 52.5m/m objective lens, Light Transmitting Power of 12.25, Fiels of 59.5 yds, Height 8 7/8", weight 37 1/16 oz No 6070 black leather $138. The lens might be 52.5mm in diameter. But the locking collar only allows 1.8125"/46mm. A 15x46.
Considering inflation $138 in 1934 equals a 2018 price of $2,595.62.
10x 46.5m/m or 1 3/8" according to the Sears 1908 ad for the 12x. The 10 & 12x probably share the same objective size. Or they started w/12x and by 1934 it was replaced w/10x. I guess that since the 12x isn't mentioned in the 1934 catalogue that perhaps it was discontinued by Busch in attempt to streamline their offerings. Maybe DuMaurier didn't think the 12x was enough of a jump from 10x or to 15x.
The Terlux dates back to the early 1900's somewhere around 1906-1909. Early models did not have lugs in first bridge for neckstrap. They had metal tabs rivited into the leather covering the barrels. There's four interesting tidbits about me 10x44.5, claimed 46.5mm Terlux previous post mistakenly called it a 12x, that I own. 56/64/74 reference points for IPD settings on a tapered brass cover that also sports Germany in quaint script/font.
The metal eyecups have brass covers w/2 tiny brass set screws c-c 3/16". The covers are cone shaped about 3/16" concave/towards the ocular w/3/8" round opening in the center. As a metal splash guard/ocular protector. Actually the collar is brass & the concave cone is of ferous metal. Two piece the cone is placed over the eyecups then the brass collar locks them down.
The leather is smooth instead of pebblegrain.
Behind the first bridge is a brass wheel checkered style, 3 rows raised diamond tips, on the edge for firm grip. Two arrows pointing opposite directions w/2 sets of 4 smaller close together mini arrows inbetween. An 'L' on the left a 'F' on the right. Lose for loose und fest for tight? Anywho it is a fancy locking IPD wheel.
Lastly the ultimate in post purchase advertising. Remember purchasing an auto only to have the dealership name in chrome bolted to the boot? Whilst the left prism cover states:
Busch Terlux
Prisma Binocle
10X
Right side:
Paul A Meyrowitz
Fifth Avenue 36th Street
New York
These were some fancy bins w/add on brass eyepiece protectors, the brass IPD lock, perhaps bling w/store name on right prism cover and I note that a bin w/SN 10,000 later the tapered brass ipd degree indicator did not have special font/script that spelled Germany. Since I've never seen another w/brass IPD locking wheel. I figured that Paul A Meyrowitz, who was an optician, perhaps had a run of these special ordered.
https://books.google.com/books?id=c...a Meyrowitz Fifth Avenue 36th Street&f=false ---scroll down to bottom of page.
The Literary Digest, Volume 40, Part 2
Ad in the 1910 literary Digest April 30 bottom of Pg 900:
ASTRONOMY with the TERLUX
_________________________
(busch prism binocular)
A booklet for Beginners
By
Kelvin McKready
A new and interesting
story of the night sky as
revealed by the Terlux
Call or write for illustrated Booklet, mentioning Dept. C
Paul A. Meyrowitz, Optician
389 Fifth Avemue, Cor. 36th St., New York
http://www.binoculars-cinecollectors.com/html/body_german.html
according to this site, "Terlux first list in Busch catalogue 1908 as Dr Hans Seeger states in second book." Terlux 12x35 ca 1914 No 74497 & 18x46 sn 84414 ca 1925-30.
http://www.fernglasmuseum.at/museum/busch_terlux_12mal/busch_terlux_12x.html
According to this site, "From 1906 - 1935 the optical company Busch produced the very successful model "Terlux. The Terlux came in different variants 6, 9, 10, 12, 15, 18 and 24 times magnification. " They have on display a 12x35 w/serial number 79407.
The 10x had four sections the 12x had three & was shorter.
If you have a Terlux post the magnification and SN.