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