Hoffmann (Professor), 1839-1919 · New York : E.P. Dutton & Co. ; London : George Routledge & Sons · leaf 105
her effects, say, the dropping of coins into a suspended glass. The manufacture of the apparatus in the first instance is a matter of great nicety, but, once properly adjusted, it is by no means likely to get out of order. In connection with devices of general utility I must not omit to mention the… … Fig. 65. demain in Messrs. Cassell's Popular Recreator, first published, if I remember right, in 1873. Fig. 6$ is
