5 66 Of Things relating to Mathematic^ ,&c. Part IV. 
An ASSAYER to. try the ftrength of Gun-powder. Con¬ 
triv’d by his Highnefs Prince Rupert. Compos’d of two 
flat, upright and parallel Stands of Bra/s, about a foot and 
* high, with a fhallow Indenture on both their inner edges. 
Upon the Bafe on which they ftand, and between them, is 
placed a Powder-Pan. Over which, a Slider , with a thin 
Plate-Spring , which plays againft the End Teeth, and two 
Arms for the charging it with weight at pleafure. The 
ftronger the Powder is, it forceth the Slider to a greater 
height. 
A WIND-GUN. Given by Dr. Wilkins late Bilhop of 
Chefter. Compofed of two Barrels, one within another. 
To which is fitted a Rod to charge it with Air. At the 
Breech, where the two Barrels are open one into the other, 
is placed a Value , to admit the Air into the outer Barrel, as 
the Rod drives it, and to keep it there. 
A Seven-SHOT GUN, or a Gun which carries Pow¬ 
der and Bullets, for feven Charges and Difcharges to be 
made prefently one after another. Given by Dudly Palmer 
Efq$. Under the Breech of the Barrel, is one Box for the 
Powder. A little before the Lock, another for the Bullets. 
Behind the Cock, a Charger: which carries the Powder 
from the Box to a Funnil at the further end of the Lock 5 
opens one Valve to let it into the Barrel, and the Prinnng- 
Pan ; another, to let in the Bullet after it; raifes the Cock 5 
and lets down the Steel; all at one time. 
An Indian Poyfon’d DAGGER. About I a yard long. 
The Hilt is a fort of Wood, as firm as Box. Very curioufly 
carved into a kind of Antique Head. The Neck, by which 
it joyns to the Blade , plated with Gold. , and embos’d with a 
Ring in the middle, in which is fet fome fmall fparks of 
Gems. The Blade about 14 inches long, and an inch 
broad about the middle 5 waved in the manner of fomc 
Swords hung up for Signs, and much expanded next the 
Hilt , the better to flay the Hand : where it is alfo curioufly 
Damask’d with Gold. But every where elfe with white 
flounfh’d Work of the colour of Silver. Saving both the 
Edges, which are left naked , and are very fharp. But 
that which is moft obfervable is the Scabbard ', which is one 
entire piece of Wood (near the colour of the belt Walnut) 
with a Cavity cut down to the bottom of it anfwerable 
to the Blade. A 
