$51 Machine for Painters and Glaziers . 
Explanation of Mr . White’s improved Letter File, as 
shown in Plate XII, jFzgs. 3, 4, 5, 6, 
This invention consists of a metal tube a, fig 4, with a 
convex circular plate soldered to its lower end, to keep 
the papers from slipping off the file, and having attached 
to its under side a piece of metal b , fig. 5, with a screwed 
hole in it, to receive a screw on the end of the wire, c, 
fig. 6, the other end of the wire being formed into a 
hook, sharpened at its point, to receive the papers as 
usual. 
When any paper is wanted to be taken off the file, (in- 
stead of taking off those above it, which cannot be repla- 
ced again without much loss of time and trouble, or, which 
is still worse, tearing it off) the uppermost papers are to 
be slipped up towards the top of the wire c, which must 
be unscrewed, and, with the papers upon it, removed, as 
shown in fig. 6 ; the paper wanted may then be taken 
away, the wire replaced again into its tube a, and screw- 
ed fast, and the other papers drawn down the tube as be- 
fore. The upper end of the tube a should be made coni- 
cal, and its edges sharp, the better to suffer the papers 
to pass over it. A section of the tube and female screw 
b beneath is shown separately at fig. 5. The papers 
are shown in fig. 3, in the situation they are commonly 
placed upon the cylinder, with the wire within the 
cylinder. 
No. 56. 
Description of Mr. Davis’s improved Machine for 
Painters and Glaziers*. 
(With a Plate.) 
THE frequent accidents which happen to painters and 
glaziers, from the unsteadiness of their machines, and the 
* Nicholson v. 19. p. 13 — From the Trans, of the Society of Arts for 1806, p. 138. 
