478

Philadelphia
Nov
19
7 PM
Pa.

Prof. C. E. Bessey
Iowa Agr. College
Ames Iowa

Philadelphia, October 1st, 1880.

Dear sir: We desire to call your attention to the

"English Mechanic & World of Science,"

an English periodical of great value, and one which is of universal interest to those
interested in scientific matters. It is a weekly illustrated journal; each number containing
twenty-four pages exclusive of advertisements, nine inches by thirteen; each
page comprising three volumes. It numbers among its regular or occasional contributors
many of the best-known names in science. We give below the table and contents of the
first number which [comes?] to hand, namely, that of July 23rd, 1880.

Contents.

Articles
[?] ... 461
[?] ... [?]
[?] ... [?]
[?] ... 464
[?] ... 465
[?] ... 465
[?] ... 466
[?] ... 466
[?] ... 466
Useful and Scientific Notes ... 467
Scientific News ... 467

Letters From [?] to [?]

Photograph of [?] [?], by Mr. S.
Wells, ed. [?], U. S. A. —Powell and Lou
[?]'s Newest Formula [?] Water [Thinner?]
[?]—Inexpensive Microscopes, etc. ... 468

Microscopical—50,000 Diameters—Supposed
[Chromatisation?] of Light by a Microscope
Slide—[Chromatisation?] of Light by a [?]
Plate—The Meteor of July 9th—Jupiter—
Periscopic Eye-pieces—[?]—Carbonic
Acid—[?]—Jupiter—57 [?]—[?] 469

Lunar Mists and Clouds—Lunar Rainbow
[Column Break]
[?]—Oxygen in the [?]—[?]
[?]—[?] [?] [?] ... 470

Alphabetical Manual of [?] [?] Analysis
—The [?] [?] [?]—The Trials
of [?] Bankers upon the Lanceshire
and Yorkshire [?]—Vapor [?]
Water Analysis ... 471

A New Tricycle—Bicycle [?]—Monitoring
Battery Plates—Aquarium—A [?]
Air Pump ... 472

[?] and the [?] Purchase System—[?]
[?] Machine [?]—[?]—"[?]"
on [?]—How to Make a Violin 473

Impure Drinking Water—The Sanitary [?]
[?]—[?] ... 474

Flight of Certain Sea [Birds?]—The Opaque
Lanter ... 475

The Achromatic Object Glass—Physical Hypotheses
—Animal [?] Vegetable ... 476

Improvements in [?] Burners—Light
Theories, etc., etc.—[?] Engine—[?]
[?] [?] [?]—A Candle Holder
for Use with the Month [?] ... 477

Replies to Queries ... 478
Unanswered Queries ... 482
Queries From [?] to [?] ... 482
[Chess?] ... 482
Answers to Correspondents ... 484

The terms of subscription are very low, namely, for the United States, "13 shillings,
or 3 dollars and 25 cents gold" (now equivalent to currency).

The following, from the English Mechanic, is self-explanatory:—
"[?], James W. Queen & Co. of 924 Chestnut Street, Philadelphia, Pa.,
are authorized to receive [subscriptions?] for the United States for the English Mechanic, at the rate
of Thirteen Shillings per annum, post free. The [?] will be forwarded direct by mail from the
publishing office in London. All subscriptions will commence with the number first issued after the
receipt of the subscription. If back numbers are required to complete volumes, they must be paid for
at the rate of 4¢ each copy, to cover extra postage."

We consider the English Mechanic superior, [in point?] of reliability and
general excellence, to any other journal of similar scope known to us–American or
foreign. It contains much that is of special interest to Microscopists. Specimen copy will
be sent on application.

Respectfully,
James W. Queen & Co.,
Opticians,
Philadelphia.

Our Complete Catalogue sent by mail, on application, as follows:
Part 1st, Mathematical Instruments, 160 pages.
Part 2d, Optical Instruments, 188 "
Part 3d, Magic Lanterns and Slides, 150 "
Part 4th, Philosophical Instruments, 188 "