Creator

Fred A. Barber

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.

Resource Identifier

muir16_1027-let.tif

File Identifier

Reel 16, Image 1027

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

University of the Pacific Library Holt-Atherton Special Collections. Please contact this institution directly to obtain copies of the images or permission to publish or use them beyond educational purposes.

Pages

2 pages

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