spinning Machine . ♦ 161 
COLCOTHAR : CROCUS MARTIS : SAF- 
FRON OF MARS. 
This is an oxyd of iron, made red by exposing it to 
heat, and used for polishing brass and iron utensils, and 
making razor straps. It is made thus. Take green 
vitriol and calcine it alone in a heat sufficient to drive off 
all the water and acid. It then becomes a brownish red 
substance which must be washed, levigated and sifted. 
Or, green vitriol is precipitated by carbonat of potash 
(pearl ash) the precipitate washed, dried, and calcined till 
it becomes red, is then levigated and sifted.^ 
DR. ALLISON’S PATENT SPINNING MACHINE, 
The annexed plate exhibits a perspective view of a very portable 
machine, chiefly designed for spinning w ool ; invented and patent® 
<ad by the rev. doctor Allison, of Burlington, New Jersey. The prim 
cipal object of the inventor was to facilitate domestic manufactory, 
literally ; or that of private families. The machihe is exceedingly 
simple in its construction, occupies very little room, is readily ma» 
naged, and has already been introduced into several farm houses, 
where it is found to answer all the purposes designed by it. Al- 
though principally designed for wool, yet it is found that it will 
Spin cotton when carded into rolls, with great facility. 
Explanation of the plate. A, B, The frame or body of the ma- 
chine, with the spindles S S, which are turned by bands passing 
round their whirls, and over the cylinder C C. Five of the 
Spindles are represented with yarn on them, and the other five 
without any, so as to shew the Wooden skeefs or case, into which 
the steel spindles are firmly inserted. At the lower part of the 
skeefs are small circular pieces of wood, tin, &c. called sluffs, 
S S slipped loosely on the skeefs, to form the cops or broaches 
of yarn on — D is a small wooden roller, supported, by gudgeona 
which play in the two pieces which project from the posts. Near 
each end of D is a small wire w, supporting a light rod r, which 
* Qne hundred parts of iron, yield about 145 parts of red oxide. 
3 N 
