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1884.] ^r^jaEi^ic?iN*i*^6i^icaii5ra]^i^¥.3!c-^ 4S7 
A Wonderful Microscope.—High Excellence with Low Cost. 
A Ti'casnre for every Family, allowing Old and lonng to view' the wonders that lie unseen all 
aronnd them, alTordiug an endless sonree of amnsement and instrnction, at a cost within the reach of all. 
—A great boon to the student—a substantial, convenient, useful and powerful working instrument, at no 
greater price than is charged for useless Toy Microscojies. Schools everywhere can now i»ossess that 
valuable edncational aid, a good Microscope. A great help to Farmers, Physicians, Tradesmen and others, 
at a heretofore unknown low cost. An equally serviceable instrument formerly cost four times as much! 
Fig. 6.—I,ENSES AlfB 
DIAPHRAGM, SEPARATE. 
fig. 4, over this stage, hold firmly upon it the slides that 
carry the objects to be examined.—The Microscope is 
also accompanied by two Olass JPlates or slides, 
and also, to be placed 
between them, a water¬ 
proof Cell for hold¬ 
ing seeds, insects, and 
other small objects and 
fluids. The lien- 
ses, figs. 5 and G, are 
of course the most 
important thing in any 
microscope. In this 
instrument there are 
THRES: of them, 
of difterent powers, 
and so arranged that 
one can be used where 
low power is required; 
a second one for a lit¬ 
tle higher power, and 
a third for a still higher power. Then again any two can 
be combined for other powers, and all three when the 
highest power of the instrument is desired. Thus seven 
difierent powers can be quickly provided, ranging from a 
magnifying power of seven diameters up to twenty-five 
or more. (It will be understood that if a lens magnifies 
twenty diameters, that is twenty times in one direction, 
it magnifies equally in all directions or twenty times 
twenty areas, or four hundred times (less what Is taken 
off from the corners, in cutting a circle out of a square). 
A circular area of twenty-five diameters is 
nearly five jinndred times that of one diameter, 
and tills (500) is the magnifying power of these 
three lenses used together.) They are of high- 
st quality glass, and ground to perfection, 
of course by automatic machinery so that there 
can be no variation of curvature. They are 
as free as possible in an instrument of this 
kind from the imperfections of ordinary len¬ 
ses, in fact nearly achromatic,a point not even 
attempted in the great mass of cheap micro¬ 
scopes sold at moderate prices. — A Ria- 
plivagm (shown at the lower left-hand ol 
fig. 6, and in fig. 5) is provided to cut off out¬ 
side light in examining minute objects, and 
concentrate the vision upon a single point. 
This turns in or out as needed.—All the Len¬ 
ses are attached (as in fig. 5) to a Sliding Rod 
Standard, fig. 7, which is moved up and 
down in a tube by the thumb-piece, making it 
thus easy to adjust the lenses to any desired 
distance from the object, in order to find the 
proper focus, and to suit them to different eyes. 
The whole apparatus is packed in a neat and remark¬ 
ably strong Box, adapted to hold it for carrying safely 
by any conveyance, and for keeping it when not in use. 
We can conceive of no more convenient arrangement 
of all the parts for pi'actical use, than are most effec¬ 
tively combined in this remarkable Simple Microscope. 
HOW SUPPLIED. 
This Simple Microscope is more valuable in the quality 
of its lenses, its arrangements, etc., than any thing we 
have seen offered for several dollars. Probably its equal 
can nowhere else be had under four or five dollars. But 
it will be supplied by ns and sent delivered free to any 
part of tbe United States and Territories for two dollars, 
and delivered free to any actual stibscrilter to the Ameri¬ 
can Agriculturist for 1885, for One Dollar and 
tvveiity-flve cents. 
Fobther.— -We will present one, delivered free, and 
send the American Agriculturist to a new subscriber, 
post-paid, during all of 1885, for two dollars. 
Further. —We will present this Microscope to any 
present snbscriber, and deliver It flree to him, who 
will send us two new subscribers to the America'n Agri¬ 
culturist for one year, at one dollar and fifty cents each. 
Take Notice ALL Subscribers. 
Any person already a subscriber to the American Agri¬ 
culturist, can have one of the above Microscopes deliver¬ 
ed free to him for one dollar and twenty-five cents. 
Partial Description.—(A full De¬ 
scription, also Prof. Phinn's “ Book on 
the Microscope ” go with each Instru¬ 
ment )—: A, Heavy jet-black iron foot. 
—B, Two iron pillars, with truuioiis 
between, allowing the instrument to turn 
to any angle from perpendicular to hor¬ 
izontal.—1>, is a METAL STAGE, With 
spring CLAMPS, which are easily adjusted 
to thick or thin plates, 
or quickly removed—E, 
Revolving diaphragm, 
with different sized ap¬ 
ertures to graduate a- 
mount of light admit¬ 
ted.—F. F, CONCAVE 
MIRROR, throwing light 
up from below through 
transparent objects; or 
turned above to throw 
light upon 
opaque ob¬ 
jects. — G, 
The BODY, 
nickel - plat¬ 
ed, which is 
moved upor 
down with 
Fig. 3.—CAMERA LUCIDA IN USE. 
great delicacy of adjustment of focus, by the rack and pinion, moved 
by tbe milled heads (one seen at H).—I, Two object 
GLASSES, used separately or together, according to power de¬ 
sired. These, the most important part of any Microscope, are 
of very superior quality.—1., is a nickel-plated 
DRAW-TUBE, 3H inches long, adding materially 
to the length of the body when higher magnify¬ 
ing power is desired.—IC (shown in section at 
the left,In fig. 2), is a very complete eye-piece, 
having all the parts of the most costly Micro¬ 
scope, viz., FIELD glass, Q; diaphragm of 
black metal, P; eye-glass, O.—All parts of 
the eye-piece are mounted in frames with re¬ 
movable screws. - Fig. 3. — The Camera 
Lucida is a new and most valuable appliance 
for throwing the image of any object, magnified 
to any desired size, upon paper in a way to be 
easily sketched with a pencil by any person, 
or by a child, if old enough to trace lines and 
marks with a pencil .—With this, one can 
n.ake a complete picture, 3 or 4 inches across, 
of the foot of a fly, the. parts of a plant, and of 
mmiy other things so small as to be almost 
invisible to the unaided eye. 
The New American Agriculturist 
COMPOUND MICROSCOPE. 
Tliis instrument is not only made expressly for the 
subscribers to tlie American Agt'icuUurist, but was in 
part invented for them by 
tile Optical Company wl;o 
made the Simple Micro¬ 
scope. The many different 
parts are all made hy accu¬ 
rate macliinery, and are 
interchangeable. The len¬ 
ses, or glasses, the most 
important part of the in¬ 
strument, instead of the 
former difficult^id uncer¬ 
tain hand work, are now 
ground and shaped by 
automatic machinery, 
whicli secures perfection 
and precision. It is no 
mere scientific toy, but is 
designed for work. It is 
provided with a Camera 
Lucida, a wonderfully simple and effective device to 
enable one to draw what is seen. Ttie manner of using 
the Camera Lucida is illustrated above in flgtire 3. By 
the aid of this Microscope a vast number of objects in¬ 
visible to the unaided eye, may he seen and examined. 
Flg.4. Microscope condensed 
In Walnut Case (8)4x41^x3V 
Inches), in which it is firmly 
held for carrying or keeping. 
Tlie structure of plants and insects may he 
studied, and the invisible beauty of multi¬ 
tudes of objects may afford amusement and 
instruction to young and old. But the Micro¬ 
scope,besides revealing hidden wonders, and 
affording interesting occup.ation in the 
home circle, plays an important part in prac¬ 
tical matters. The fibres of cotton, linen, and 
silk each presents acbaracteristic appearance 
tinder tlie Microscope, which allows them to be readily 
distinguished, and any fraudulent substitution of one for 
anotlier in a fabric, may be at once detected. Diseased 
meats, especially pork containing trichines, are danger¬ 
ous to health and life ; their character may be at once as¬ 
certained by tlie Microscope. Tlie adulterations now so 
common in various articles of food and medicine, are in¬ 
stantly revealed by tbe Microscope. Among otlier uses is 
tlie valuable aid it gives to physicians in determining tlie 
character of diseases, and tbe presence of their germs. 
Price $ 15 (or $10 to American Agriculturist sub- 
scrilicrs, for whom it was specially designed).—Ji^'^Tliis 
price includes the Camera Lucida, tbe Walnut Case (fig. 
4) packed in an exterior box, so that it will go safely 
anywliere, liy express ; also a free copy of Prof. Phinn’s 
Book on tbe Microscope, some glasses, etc.—Carriage 
paid by recipients. 
The wliole will also be Presented to any one fur- 
nisliing 10 siiliscriptions to the Awierican Agriculturist 
at $1.50 a year eacli. The Teachers or Pupils in 
every school not already supplied should at once make 
up a subscription club, and secure this Microscope for 
the benefit of all. Plenty of people would take the 
paper for their own use, when by so doing they would 
help so valuable an enterprise. 
N. B .—Anyone desiring the above Microscope for imme¬ 
diate use, or as a present, can forward $10 and receive it, 
and deduct the $10 from the subscription money if he after¬ 
wards makes up a Premium Club for it, as above offered. 
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NO SUBSCRIPTION CAN COUNT TOWARDS MORE THAN ONE PREMIUM IN ANY CASE. 
