235 
gems or coins, adding several thicknesses. But for such small 
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. 
The selection of a photographic outfit depends largely 
upon the country to be visited, and the work that is required 
to be done. Where transport presents no difficulties, take as 
large a camera as possible. half plate camera is little 
superior to a quarter-plate for direct reproductions ; and, 
while the latter is more portable and its negatives are not 
only less liable to breakage but also better suited for enlarge¬ 
ments and lantern slides, the half plate has most of the 
disadvantages of the really large apparatus with few of the 
advantages of the small. 
The main point to bear in mind in selecting a camera is its 
adaptability for various kinds of work. For all round work 
the most satisfactory type of lens is a rapid symmetrical or 
rectilinear lens in which the front lens screws off so as to leave 
a single lens ; perhaps the best lenses in the market are the 
Zeiss Anastigmat and the Gorz, and it is most desirable to 
have the best possible lens. It would be found very con¬ 
venient to include in the outfit lenses of various focal lengths. 
