64 
HINTS TO TRAVELLERS. 
lighter. It will weigh, when packed with the apparatus and a gross of 
7i x 5 plates, about 60 lbs. 
Travellers interested in anthropology might read Mr. E. E. im Thurn’s 
paper on the Anthropological Uses of the Camera, published in the 
‘ Proceedings of the Anthropological Society; 5 also the paper read in 
May 1900 by Professor Haddon. 
Photography in Natural Colours . 
It is now possible for the traveller to bring home records of what he 
has seen in natural colours. There are two or three known methods by 
which this may be done, but only one available for the work of ex¬ 
ploration. The method has been patented by Mr. Ives, and is named 
Kromskop photography. It is briefly as follows. It is based upon the 
principle that the varied hues in nature are physiologically equivalent to 
mixtures of three spectrum colours, red, green, and blue-violet. The 
Kromskop photograph is made up of three images which have the 
appearance of ordinary uncoloured lantern slides, but which are simply 
three registers, each of the distribution and proportion of a primary 
colour in the object photographed. Each photograph is thus a colour 
record—one blue record, another red, and a third green. In order to 
obtain three colour records, the photographs are taken each through a 
colour screen, and the result is that each of the primary colours registers 
only what is required for its own reproduction. Mr. Ives has designed 
a Kromskop for combining the three primary colour records in perfect 
register, and the result of the combination is a perfect representation of 
the object photographed in all its natural colours. 
Photographs so taken are available for the Lecture-Room, and may be 
exhibited to an audience on a screen by the use of a properly appointed 
Triunal Optical Lantern. The Kromskop Company supply outfits, and 
give full instructions for the use of their instruments. The first ex¬ 
plorer to make use of this most beautiful and perfect of all photographic 
processes was Mr. Mackinder in his recent exploration of Mount Kenia. 
As the result of his successful endeavour two illustrations in natural 
colours were published in f The Geographical Journal, 5 April 1900. 
