The Latest and Best Process Employed by Cutters and Others in Etching
Names and Designs on Steel.--Take copper sulphate, sulphate of alum
and sodium chloride, of each 2 drachms, and strong acetic acid 1-1/2
ounces, mixed together. Smear the metal with yellow soap and write
with a quill pen without a split.
The History of the Discovery of Circulation of the Blood recapitulated,
divides itself naturally into a series of epoch-making periods: 1. The
structure and functions of the valves of the heart, Erasistratus, B.C. 304.
2. The arteries carry blood during life, not air, Galen, A.D. 165.
3. The pulmonary circulation, Servetus, 1553. 4. The systemic circulation,
Caesalpinus, 1593. 5. The pulmonic and systemic circulations, Harvey, 1628.
6. The capillaries, Malpighi, 1661.
How to Make Hand Fire Grenades.--Make your hand grenades. Fill
ordinary quart wine bottles with a saturated solution of common salt,
and place them where they will do the most good in case of need. They
will be found nearly as serviceable as the expensive hand grenades
you buy. Should a fire break out, throw them with force sufficient to
break them into the center of the fire. The salt will form a
coating on whatever object the water touches, and make it nearly
incombustible, and it will prove effectual in many cases, where a fire
is just starting, when the delay in procuring water might be fatal.
How the Kind of White Metal is Made That is Used in the Manufacture
of Cheap Table Ware.
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