235 
objects tinfoil is the best, either beaten by a tooth brush or 
squeezed by the fingers. 
A photograph, tracing, or drawing usefully supplements a 
squeeze, and if the surface of the stone be smooth enough, a 
rubbing with heel-ball may be made. Another method of 
making the squeeze more distinct is to dab it with colour 
mixed with water containing a little gum or size. This pro¬ 
cess is of course subsequent to all the operations of squeezing, 
and while the squeeze is drying upon the stone. 
The simplest and quickest method of all is to make a 
rubbing, using grass or leaves in place of heel-ball. Common 
Japanese paper is the best for rubbings ; it is very strong, 
and not being sized, it is little affected by damp.. 
W. M. F. P, 
No. LXXVIL—PHOTOGRAPHY. 
In addition to the ordinary information of photographic 
hand-books, a few special details for travellers may be noted. 
A tin-plate camera is desirable, as it cannot be broken or 
cracked by heat, but it must be specially ordered. The light 
tight slide of the body is best fitted by a pad of black 
linen folded over 8 or 10 times, as this gives great elasticity, 
and can be refolded with extra turns in it if it should not be 
tight enough. If plates of small size are used, it is best to 
have a plate box, holding 20 or 30, made in one with the 
camera, the plates standing beneath parallel with their place 
in the camera; changing is then done by the fingers in a 
dark bag, permanently fastened on to the side of the camera 
and plate box, furnished with a short sleeve to admit the 
hand. No plate holders are thus required, the ground glass 
is withdrawn from the camera, and the dry plate inserted in 
its place. The shutter of the camera back slides into the bag 
when focussing. The dark bag should be of two thicknesses 
of black linen, with strips of tin foil coating the inner linen, 
stuck on with touches of varnish; and inside the linen a 
similar black silk bag. Each of the three bags should be 
