Creator
Fred A. Barber
Recipient
John Muir
Preview
Transcription
A. G. BARBER, PRES & TREAS.F. A. BARBER, VICE PRES. FOUNDED 1889. INCORPORATED 1894R. C. THOMPSON, ASST TREASMANAGERW. W. SLADE, SECRETARY, SUPERINTENDENT. GLOBE OPTICAL COMPANYMANUFACTURERS IMPORTERS EXPORTERSOPTICAL GOODS. MARLBORO BUILDING, 403 WASHINGTON ST. SURGICAL INSTRUMENTS, EYE, EAR, NOSE & THROATNEW ENGLAND AGENTSHARDY'S OPHTHALMOMETERSDE-ZENGS LUMINOUSINSTRUMENTSSHUR-ON & SO-EASYMOUNTINGSMAKERS OFTORIC AND SPECIAL LENSESINVISIBLE BIFOCALSOPTICAL MACHINERYAND WORK BENCHESGLOBE TABLES AND CABINETSGLOBE EAR-PHONESBOSTON. 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. diametersWith the microscope, using 2/3" objective and l" eye-piece, ............................................................... 87 diametersWith 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
Location
Boston
Date Original
1907-09-18 00:00
Source
Original letter dimensions: 26 x 20.5 cm.
Resource Identifier
muir16_1027-let.tif
File Identifier
Reel 16, Image 1027
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
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.
Page Number
Page 1
Keywords
John Muir, correspondence, letters, author, writing, naturalist, California, correspondent, mail, message, post, exchange of letters, missive, notes, epistle
