Creator
Fred A. Barber
Recipient
John Muir
Transcription
A. G. BARBER, PRES & TREAS.
F. A. BARBER, VICE PRES.
FOUNDED 1889.
INCORPORATED 1894
R. C. THOMPSON, ASST TREAS
MANAGER
W. W. SLADE, SECRETARY,
SUPERINTENDENT.
GLOBE OPTICAL COMPANY
MANUFACTURERS IMPORTERS EXPORTERS
OPTICAL GOODS.
MARLBORO BUILDING, 403 WASHINGTON ST.
SURGICAL INSTRUMENTS,
EYE, EAR, NOSE & THROAT
NEW ENGLAND AGENTS
HARDY'S OPHTHALMOMETERS
DE-ZENGS LUMINOUS
INSTRUMENTS
SHUR-ON & SO-EASY
MOUNTINGS
MAKERS OF
TORIC AND SPECIAL LENSES
INVISIBLE BIFOCALS
OPTICAL MACHINERY
AND WORK BENCHES
GLOBE TABLES AND CABINETS
GLOBE EAR-PHONES
BOSTON. Sept. 18, 1907.
Sr. John Muir,
Martinez, California.
Dear Mr. Muir:-
I have just arrived in Boston, after a three weeks' strenuous business trip to close my Western trip. I am advised by the Bausch & Lomb Optical Company that a l/2" eye-piece could be used to advantage with your 2/3" objective for work on opaque objects. So I have ordered one sent to you and also a l/2" hand magnifier, as I agreed when I was in Marteniz. Together with the outfit you already have, including the 1" hand lens I left with you, these will give you the following powers:-
With the 1" hand lens .................. 10. diameters
" " l/2" " " ...............20 "
" microscope, using 2/3" objective and 2" eye-piece,
............................................. 41. diameters
With the microscope, using 2/3" objective and l" eye-piece,
............................................................... 87 diameters
With the microscope, using 2/3" objective and 1/2" eye-piece,
............................................................... 146 diameters
With the microscope, using l/6" objective and 2" eye-piece,
.................................................................. 205 diameters
With the microscope, using l/6" objective and 1" eye-piece,
.................................................................. 385 diameters
With the microscope,using l/6" objective and 1/2" eye-piece,
........................................................................ 720 diameters.
It is doubtful, however, if you would get very satisfactory results using the l/6" objective, as the focus is so short it cuts off most of the light. However, this will be improved when you get your vertical illuminator. I understand that they hope to be able to mail you this within 10 days. I will follow up the matter and see that you get it as soon as they can possibly send it from the factory.
(continued)
03944
Second Sheet
GLOBE OPTICAL COMPANY
J. M. #2
If any questions arise regarding the use of the microscope or along any other line, I shall be glad to answer them, if possible, if you will write me. I have not yet received the bill from the factory for all of your outfit. Will send it to you as soon as I receive it.
With best wishes, I am,
Very truly yours,
[illegible]
Dic. P.A. Barber
S.
03946
Location
Boston
Date Original
1907 Sep 18
Source
Original letter dimensions: 26 x 20.5 cm.
Recommended Citation
Barber, Fred A., "Letter from Fred A. Barber to John Muir, 1907 Sep 18." (1907). John Muir Correspondence (PDFs). 3770.
https://scholarlycommons.pacific.edu/muir-correspondence/3770
Resource Identifier
muir16_1027-let.tif
File Identifier
Reel 16, Image 1027
Collection Identifier
Online finding aid for the microform version of the John Muir Correspondence http://www.oac.cdlib.org/findaid/ark:/13030/kt0w1031nc
Copyright Status
Copyright status unknown
Copyright Statement
Some letters written to John Muir may be protected by the U.S. Copyright Law (Title 17, U.S.C.). Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Responsibility for any use rests exclusively with the user.
Owning Institution
Holt-Atherton Special Collections, University of the Pacific Library. Please contact this institution directly to obtain copies of the images or permission to publish or use them beyond educational purposes.
Pages
2 pages
Keywords
Environmentalist, naturalist, travel, conservation, national parks, John Muir, Yosemite, California, history, correspondence, letters
