The Balplan was the flagship microscope made by Bausch & Lomb Inc. In the 1970's and 80's, before the merger of their microscope operations into the Leitz / Leica company. Since the Balplan is no longer supported by either company, the knowledge base for maintenance on this fine instrument has defaulted to the community of amateur. The following Bausch & Lomb microscopes have been optically and mechanically refurbished by our factory trained technicians. 1 Year mechanical warranty included. We have thousands of used Bausch & Lomb microscopes and parts. Not all are photographed and documented yet. Brian Bracegirdle’s 1996, Notes on Modern Microscope Manufacturers, page 70. What I believe to be of more interest is the second table which is shown below. For Spencer/Spencer Lens Co./American Optical Serial Number Approx. Date of Shipment Serial Number Approx. Date of Shipment Serial Number Approx. Date of Shipment 10,000 About Jun. Nov 13, 2015 Bausch & Lomb KA Greenough-Style Binocular Stereomicroscope - The Bausch & Lomb Binocular Microscope K consists of the twin body tubes and eyepieces of the company's KA Greenough-style microscope mounted on a simple horseshoe stand. Each body tube is fitted with an achromatic objective, a Huygenian eyepiece, and a Porro prism. Bausch & lomb brinell microscope, catalog number 31-29-46. Bausch & lomb brinell microscope, catalog number 31-29-46. Complete multi spindle acme & davenport shop.
Until 1942 Bausch & Lomb used a standard numeric sequence for the Serial numbers for their lenses. [1]
Bausch & Lomb until 1942 (numeric)
Serial nº | Year |
1 | 1876 |
150 | 1877 |
350 | 1878 |
800 | 1879 |
1100 | 1880 |
1450 | 1881 |
1750 | 1882 |
2000 | 1883 |
2500 | 1884 |
3000 | 1885 |
3800 | 1886 |
4500 | 1887 |
5300 | 1888 |
6375 | 1889 |
7600 | 1890 |
9200 | 1891 |
10000 | 1892 |
11700 | 1893 |
13900 | 1894 |
17000 | 1895 |
20000 | 1896 |
25000 | 1897 |
28000 | 1898 |
30000 | 1899 |
32000 | 1900 |
33000 | 1901 |
35000 | 1902 |
40000 | 1903 |
45000 | 1904 |
52000 | 1905 |
57000 | 1906 |
63000 | 1907 |
69000 | 1907 |
76000 | 1909 |
82000 | 1910 |
86000 | 1911 |
89000 | 1912 |
95000 | 1913 |
98000 | 1914 |
104000 | 1915 |
110000 | 1916 |
120000 | 1917 |
129000 | 1918 |
135000 | 1919 |
140000 | 1920 |
148000 | 1921 |
155000 | 1922 |
160000 | 1923 |
170000 | 1924 |
175000 | 1924 |
180000 | 1925 |
185000 | 1926 |
190000 | 1926 |
195000 | 1927 |
200000 | 1928 |
205000 | 1929 |
215000 | 1929 |
225000 | 1930 |
230000 | 1931 |
235000 | 1932 |
240000 | 1934 |
244000 | 1935 |
247000 | 1935 |
250000 | 1936 |
260000 | 1937 |
270000 | 1938 |
280000 | 1939 |
290000 | 1940 |
300000 | 1940 |
310000 | 1941 |
320000 | 1942 |
![Microscope Microscope](https://live.staticflickr.com/5717/22821718607_5d0dc6e86c_b.jpg)
Bausch & Lomb from 1942 (alphanumeric)
From 1942 Bausch & Lomb used an alphanumeric code for the lenses, where the first letter encodes the year and the second letter (apparently) the class of lens
Letter | First Letter (year) | Second Letter (lens class) |
A | 1941 | aerial lens |
B | 1945 | |
C | 1949 | |
D | 1953 | |
E | 1957 | |
F | 1961 | photographic lens |
G | 1963 | |
H | 1959 | |
J | 1955 | |
K | 1951 | |
L | 1947 | |
M | 1943 | |
N | 1962 | |
P | 1958 | |
R | 1954 | |
S | 1950 | lens for survey cameras |
T | 1946 | |
U | 1942 | |
V | 1944 | |
W | 1948 | |
X | 1952 | |
Y | 1956 | |
Z | 1960 |
![Bausch Lomb Serial Numbers Microscope Bausch Lomb Serial Numbers Microscope](https://3.bp.blogspot.com/-9P1OJwM2Gvw/Wnm0wpAUJbI/AAAAAAAABG0/-243ZLmxMvw9AvEU_fn73Xop9_KNETlKgCLcBGAs/s1600/texword-math.png)
Notes
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THE SURVEYING INSTRUMENTS OF BAUSCH & LOMB
Bausch And Lomb Microscope Catalog
Bausch & Lomb Optical Company (now just Bausch & Lomb, Incorporated), was founded in 1853 by John J. Bausch and Henry Lomb. German born, Bausch and Lomb settled in Rochester, New York, where John Bausch started a small business making eyeglasses. He was soon joined by Henry Lomb. The firm remained small until they bought the rights to make eyeglass frames of 'Vulcanite', an early form of hard rubber. By the late 19th century the firm was flourishing with John's son, Edward Bausch, taking a very active role. Edward Bausch added the manufacture of microscopes to the company's product line, and by 1900, the company was making microscopes and accessories, slide and opaque projectors, photographic lenses and prism binoculars--but no surveying or engineering instruments. That changed in 1905 when George N. Saegmuller moved his companyfrom Washington, D. C. to join with Bausch & Lomb in anew firm, the Bausch, Lomb, Saegmuller Company. This new company was established to manufacture geodetic and engineering instruments and, most importantly, rangefinders and gun sighting devices for military use. This firm continued fromthe spring of 1905 to the end of 1907. For some years previously, Bausch & Lomb had been making binoculars and photographic lenses under license to Carl Zeiss, of Jena, Germany; the world's leading optical manufacture at that time. In 1907, Zeiss bought 20% of Bausch & Lomb and about 33% of Bausch, Lomb, Saegmuller. The company was renamed Bausch & Lomb but was known as the 'Triple Alliance' and the new logo featured three prisms, each with the initials of the participating organizations: 'B-L', 'Z' and 'S'. This partnership continued until November 1915 when the conflicts of World War I ended the 'Triple Alliance' because Bausch & Lomb was selling military equipment to Great Britain, Germany's enemy. Production of surveying instruments ceased sometime between the entry of the United States into World War I in April 1917 and the spring of 1918, when production of goods for civilian use was suspended. Bausch & Lomb concentrated its efforts on making rangefinders, gun sights, binoculars, trench periscopes, search light mirrors, optical glass and other materials for military use. At the end of World War I in 1918, Bausch & Lomb decided not to return to making engineering instruments. Competition from long established firms like W. & L. E. Gurley, Keuffel & Esser, Buff & Buff, and C. L. Berger & Sons was too great. Bausch & Lomb had developed a very successful military business which it continued to exploit. ~Thomas Garver
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Transit with auxiliary telescope and counterpoise plummet | |||
Engineers Precise Level donated by David Lee Ingram | |||
8' Theodolite with European 3 screw base | |||
Miniature Alidade | |||
Precise Dumpy Level made to the specifications of the U. S. Coast and Yamaha rd 250 service manual. Icom serial number decoding. Geodetic Survey |